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Heat, Drought, and Habitability in Odisha: A Comprehensive Research Compilation

Compiled: 2026-04-03 Purpose: Reference document for SeeUtkal analytical series on environmental stress in Odisha Word count: ~11,500 words (excluding sources)

1. Odisha as India’s Heat Capital

IMD Heat Wave Definition

Before examining Odisha’s data, the India Meteorological Department’s formal criteria matter for understanding what counts as a heat wave:

  • A heat wave is not declared until the maximum temperature reaches at least 40 degrees Celsius for plains and 30 degrees Celsius for hilly regions. [IMD, FAQ on Heat Wave]
  • For stations where the normal maximum temperature is at or below 40 degrees Celsius, a heat wave is declared when the departure from normal is 5-6 degrees Celsius, and a severe heat wave when the departure is 7 degrees or more. [NDMA, Heat Wave]
  • For stations where the normal maximum temperature exceeds 40 degrees Celsius, a heat wave requires a departure of 4-5 degrees, and a severe heat wave requires 6 degrees or more. [IMD Definition Document]
  • An automatic heat wave declaration occurs when the actual maximum temperature reaches 45 degrees Celsius or more, regardless of the station’s normal temperature. [IMD]

By these criteria, much of western Odisha qualifies for heat wave classification on a routine basis during April-June. When Titlagarh or Bolangir crosses 46-48 degrees, these are severe heat wave events by any definition.

The Temperature Record

Odisha routinely records some of the highest temperatures anywhere in India. The state’s western and interior districts --- Titlagarh, Bolangir (Balangir), Sambalpur, Sonepur (Subarnapur), Boudh, Jharsuguda, Angul, and Bargarh --- function as a persistent heat belt where summer temperatures crossing 45 degrees Celsius is not exceptional but expected.

All-time records:

  • Titlagarh: 50.1 degrees Celsius (June 5, 2003) --- the highest temperature ever recorded in Odisha and one of the highest reliably recorded anywhere in India. Titlagarh also recorded 48.1 degrees Celsius on April 30, 1999, and 48.5 degrees Celsius in April 2016. [Deccan Chronicle, 2016; Wikipedia - Titlagarh]
  • Titlagarh: 49.6 degrees Celsius (April 26, 1976) --- the all-time highest temperature for the month of April in the state. [IMD historical records]
  • Boudh: 45.2 degrees Celsius (2024 season peak) --- Boudh and Baripada jointly recorded the highest temperature in Odisha during the 2024 heat season. [Kalinga TV, 2024]
  • Bolangir: 46.4 degrees Celsius (May 2024) --- recorded alongside Titlagarh at 46.6 degrees Celsius, with four places in Odisha simultaneously crossing 46 degrees. [OdishaTV, 2024]
  • Jharsuguda: 45.4 degrees Celsius (April 2025) --- the hottest place in the state on that day, with 14 towns recording above 40 degrees simultaneously. [The Week, 2025]
  • Talcher: 46.3 degrees Celsius (April 2019) --- the Angul-Talcher industrial corridor functions as both an urban and industrial heat island. [Business Standard, 2019]

Increasing Heat Wave Frequency

India Meteorological Department (IMD) data demonstrates an accelerating trend:

  • The annual frequency of hot days in Odisha has been increasing at 5.1 days per decade, significantly above the eastern India regional average of 2.0 days per decade. [ResearchGate, Year-wise heat wave days in Odisha]
  • The mean temperature of Odisha increased by approximately 0.3 degrees Celsius over three decades (1981-2010), with the most accelerated warming of approximately 0.9 degrees Celsius occurring in the single decade from 2001 to 2010. [Springer Nature, Spatiotemporal patterns of surface temperature over western Odisha]
  • Most IMD stations across Odisha show an increasing trend in both the duration and frequency of heat waves during the March-June season. [IMD, Climatology and long-term trends of Heat Waves, Chapter 4]

The 2024 Heat Season

The 2024 Indian heat wave was particularly devastating for Odisha:

  • 147 officially reported heat-related deaths in the state. [Wikipedia, 2024 Indian heat wave]
  • On a single day (June 3, 2024), 45 deaths were recorded in 24 hours, pushing the toll from 96 to 141. [Business Standard, 2024]
  • The April 2024 heatwave was distinctive because coastal stations --- Bhubaneswar and Balasore --- recorded unprecedented figures above 40 degrees Celsius, extending heat stress beyond the traditionally affected western belt. [ScienceDirect, Heatwave-induced thermoregulatory stress in Odisha’s coastal districts, 2025]
  • Bhubaneswar recorded its highest temperature of the year at 43.8 degrees Celsius. [Kalinga TV, 2024]

The 2025 Heat Season

The 2025 season began earlier than any previous year:

  • India recorded its earliest heatwave and warm nights in 2025 according to IMD. [Down To Earth, 2025]
  • By March 2025, Boudh recorded the highest temperature in India on multiple days, with western Odisha already crossing 41 degrees before April. [Down To Earth, 2025]
  • The Odisha government issued its annual 11 AM-3 PM outdoor work ban effective April 1, with guidelines remaining in force through June 15. [Sambad English, 2025; Pragativadi, 2025]

The 1998 Catastrophe

Odisha’s heat crisis entered global consciousness in May 1998 when hospitals across the state reported 2,042 deaths due to heat stroke --- a toll exceeding many epidemic events. The heat wave killed across both the traditionally hot western interior and the coastal belt, which had never previously been known for extreme heat mortality. This event fundamentally changed how Odisha’s government classified heat waves --- elevating them from a weather inconvenience to a disaster on par with cyclones and floods. [Down To Earth, 2015; Business Standard, 2015]

Year-by-Year Mortality Data

Official heat stroke death figures for Odisha (where available from various government sources):

  • 1998: 2,042 deaths --- the single worst heat event in the state’s recorded history. [OSDMA; Down To Earth]
  • 2015: Approximately 35 deaths in Odisha (within a national toll of 2,081 deaths that year --- the deadliest year nationally since 1998). [PMC, Vulnerability and Adaptation study]
  • 2024: 147 officially reported deaths. [Wikipedia, 2024 Indian heat wave]

Between 2010 and 2018, over 6,100 people died in India due to heat waves, with Odisha, Andhra Pradesh, Telangana, and West Bengal together reporting more than 90% of the total deaths. [ReliefWeb, 2019]

The Underreporting Problem

The official figures almost certainly represent a fraction of actual heat-attributable mortality:

  • Classification mismatch: Heat deaths are frequently recorded as cardiac arrest, stroke, dehydration, or “natural causes.” Unless a medical examiner specifically attributes death to heat stroke, it does not enter the heat mortality database. [Down To Earth, 2024]
  • Reporting discrepancies: Different government agencies --- NDMA, NCRB (National Crime Records Bureau), and the Ministry of Earth Sciences --- report different numbers that differ by nearly a factor of two for the same periods. [Factly.in, Data discrepancies in heat wave related deaths]
  • Rural invisibility: Deaths in remote villages, among agricultural laborers, or among the elderly living alone may never be medically certified or reported. The infrastructure for post-mortem examination is thin in western Odisha’s interior.
  • HeatWatch analysis: Scientists have argued that India had over 700 heat deaths in 2024 alone --- far higher than the official government toll --- and emphasized the urgent need for a transparent, publicly accessible data system. [Down To Earth, 2024]
  • Between 2000 and 2020, NCRB reported 20,615 heatstroke deaths across India, but this is widely considered a severe undercount. [NCRB data via various sources]

Comparison with Other States

Odisha consistently ranks among the top three states for heat-related mortality alongside Andhra Pradesh/Telangana and Uttar Pradesh. What distinguishes Odisha is the concentration of deaths in a relatively compact geography --- the western heat belt --- affecting a population that is simultaneously the poorest, most drought-prone, and most migration-dependent in the state.

3. The Western Odisha Heat Belt

Geography of Vulnerability

The districts that constitute Odisha’s heat belt form a contiguous region in the state’s western and central interior:

Core heat belt districts: Bolangir, Bargarh, Nuapada, Kalahandi, Sonepur (Subarnapur), Boudh, Sambalpur, Jharsuguda, Angul

Why these districts are structurally hotter:

  • Landlocked position: Unlike coastal Odisha (Puri, Bhubaneswar, Cuttack, Balasore), which benefits from sea-breeze moderation from the Bay of Bengal, western Odisha sits on an elevated interior plateau with no maritime cooling influence. The coast is 200-400 km away. [Geography of Odisha, Wikipedia; Odisha PCS Notes]
  • Chota Nagpur Plateau extension: The western and northwestern portions of the state are geologically part of the Chota Nagpur plateau --- an upland terrain that traps heat and receives less rainfall than the coastal plains. [Odisha Government, Topography]
  • Loo winds: The hot, dry westerly winds (Loo) from central India affect western and central Odisha directly, raising temperatures significantly above what the latitude alone would suggest. Coastal areas are partially shielded. [Climate of Odisha, Testbook]
  • Rainfall deficit: Balangir and western districts receive the lowest rainfall in Odisha at less than 1,200 mm annually, compared to Malkangiri and Koraput which receive over 1,600 mm. The long-term precipitation trend (1990-2022) shows a declining trend in the southwestern part of Odisha including Kalahandi and Bolangir in all months other than the monsoon. [Springer Nature, Spatiotemporal rainfall trend analysis; Scribd, Rainfall Patterns in Odisha Districts]

The Triple Convergence

What makes western Odisha’s heat belt distinctive --- and potentially catastrophic --- is the convergence of three vulnerabilities in the same geography:

  1. Heat: Temperatures routinely crossing 45 degrees Celsius for weeks at a time
  2. Drought: Chronic rainfall deficit, groundwater depletion, and rain-fed agriculture
  3. Poverty: Some of India’s highest poverty rates, lowest wages, and highest distress migration

This is not coincidence. These three factors are causally linked: heat worsens drought, drought destroys livelihoods, destroyed livelihoods deepen poverty, and poverty eliminates adaptive capacity against heat. The loop reinforces itself.

Desertification

The heat-drought convergence in western Odisha is driving measurable desertification:

  • 42.49% of Odisha’s total geographical area was affected by desertification in 2012, up from 35% in 2004 --- a significant acceleration. [Switch On Foundation, Land degradation, desertification, and drought in Odisha, 2024]
  • In Balangir district specifically, deforestation followed by drought-driven degradation has increased albedo (radiated heat), intensified water stress, and deteriorated soil quality, converting the surroundings of several villages into dry, shrubby brown landscape. [PreventionWeb, India: Farmers push back desertification in Odisha]
  • The reported average temperature rise of 8 degrees Celsius in Balangir over 30 years (likely referring to peak summer temperature increases rather than mean annual) reflects the thermal feedback loop: deforestation increases surface heat absorption, which worsens drought, which kills more vegetation, which further increases heat. [PreventionWeb]
  • Community-led agroforestry interventions have shown promise: in the Belpada block of Bolangir, more than 90% of agricultural land was found suitable for agroforestry interventions including bund plantation and intercropping. Community interventions to dig wells and ponds have enabled some farmers to irrigate about 150 acres even during the dry season. [CIFOR-ICRAF, A Road Less Travelled by Migratory Farmers, 2020; MDPI Sustainability, Agroforestry Suitability, 2022]

Industrial Heat Amplification

The Angul-Talcher industrial corridor adds an additional dimension. Research has identified an “industrial heat island” (IHI) effect in this region --- distinct from a conventional urban heat island --- driven by coal mining operations, thermal power plants, and aluminium smelting. Mining activities and emissions from coal-fired thermal power plants in both the Talcher coalfield and the Ib Valley coalfield (Jharsuguda) have significantly contributed to local temperature increases. [Springer Nature, Industrial heat island: a case study of Angul-Talcher region, 2020]

4. Wet Bulb Temperature and Habitability Thresholds

The Wet Bulb Concept

Wet bulb temperature (WBT) measures the combined effect of heat and humidity on the human body’s ability to cool itself through perspiration. Unlike dry bulb temperature (what a standard thermometer reads), WBT captures whether sweat can actually evaporate and carry heat away from the body.

Key thresholds:

  • 35 degrees Celsius WBT: Theoretical upper limit of human survivability. At this level, a healthy person sitting in the shade with unlimited water will still accumulate lethal heat because the air is too warm and humid for sweat to evaporate. [PNAS, 2023; PMC, Temperature and humidity based projections]
  • 31-33 degrees Celsius WBT: Revised lower threshold identified by recent empirical research. A 2023 study in PNAS found that the actual human tolerance limit is lower than 35 degrees WBT --- closer to 31 degrees for young healthy subjects and lower still for elderly, ill, or working populations. This finding means the danger zone is closer than previously thought. [PNAS, Greatly enhanced risk to humans, 2023]
  • 28-30 degrees Celsius WBT: The range at which outdoor manual labor becomes dangerous. Productivity drops sharply and heat illness risk escalates.

Current Readings in Odisha

Wet bulb temperatures in coastal Odisha and West Bengal already reach over 30 degrees Celsius during peak heat wave events. [McKinsey, Will India get too hot to work?, 2020] Western Odisha’s interior, while typically drier (which lowers WBT relative to dry bulb temperature), experiences extreme dry heat that is lethal through a different mechanism --- direct thermal overload rather than humidity-trapped heat.

The combination is worst along the coastal-interior transition zone and during pre-monsoon humidity buildups in May-June, when western Odisha’s temperatures remain above 45 degrees while humidity rises sharply.

Projections: How Close Are We?

By 2050 (RCP 8.5 / SSP5-8.5 --- high emissions scenario):

  • Portions of eastern India including Odisha could begin to experience heat waves that cross the 35-degree WBT survivability threshold with a probability of occurrence at least once per decade approaching 80%. [McKinsey, 2020]
  • 160-200 million people in urban India could be living in areas with a non-zero annual probability of a lethal heat wave as soon as 2030, rising to 310-480 million by 2050. [McKinsey, 2020]
  • Areas particularly in Uttar Pradesh, Bihar, and Odisha are where wet bulb temperatures are projected to approach or exceed the survivability threshold under high-emissions scenarios. [Science Advances, Deadly heat waves projected in densely populated agricultural regions of South Asia, 2017]

By 2100 (Climate Impact Lab / Tata Centre for Development study):

  • Odisha’s average summer temperature is projected to rise by 3.32 degrees Celsius --- from 28.87 degrees Celsius in 2010 to 32.19 degrees Celsius by 2100 --- far higher than the national average increase. [Climate Impact Lab, 2019; The Federal, 2019]
  • The number of extremely hot days in Odisha has been projected to increase by 30 times --- from 1.62 per year in 2010 to 48.05 by 2100 under the high-emissions scenario. [Climate Impact Lab, 2019]
  • Odisha may witness 42,334 additional deaths every year due to extreme heat by 2100, according to this study --- almost five times more than the total deaths the state currently records from cardiac arrest annually. [Climate Impact Lab / Tata Centre for Development, 2019; Business Standard, 2019; EPIC Chicago, 2019]

The Lancet Countdown

The Lancet Countdown on Health and Climate Change has documented escalating heat-health impacts globally and for India specifically:

  • In 2024, heat exposure in India led to an estimated 247 billion potential labor hours lost, resulting in an estimated $194 billion in income losses. [Lancet Countdown, India Data Sheet 2024]
  • In India and Pakistan combined, heat-related mortality exceeds 200,000 deaths per year when using comprehensive epidemiological methods rather than official government tallies. [Lancet Countdown; WHO, 2025]
  • Between 2000 and 2019, approximately 489,000 heat-related deaths occurred globally each year, with 45% in Asia. [Lancet Countdown, 2024 Report]

5. Agricultural Impact

Rice: Odisha’s Staple Under Threat

Odisha is one of India’s major rice-producing states, with rice dominating the kharif (monsoon) cropping season. The crop is acutely sensitive to heat stress at specific growth stages.

Temperature thresholds for rice:

  • 35 degrees Celsius: Spikelets at anthesis (flowering) exposed to temperatures above 35 degrees for 4-5 days become completely sterile and produce no seed. This is caused by poor anther dehiscence and low pollen production. [Journal of Experimental Botany, 2007]
  • 33 degrees Celsius: A more sensitive critical threshold identified for subtropical rice varieties, beyond which large sterility increases are observed. Even a single hour of exposure at or above 33.7 degrees at anthesis can cause sterility in some genotypes. [Various rice heat stress studies]
  • Yield loss estimates: Rice yield declines by approximately 15% per 1 degree Celsius increase on average, with projections showing yield loss by end-of-century between 3-22% depending on emission scenario. [Nature, PMC studies]
  • Warming impacts of 0.5-2.0 degrees Celsius increase daily temperature increases sterility between 2.9-13.1 percentage points for the dry summer season. [FAO AGRIS, Temperature thresholds for spikelet sterility]

Kharif-rabi cycle disruption:

The rice-wheat/pulse cropping system is sequential --- the harvest date of kharif rice directly affects planting dates for rabi (winter) crops. Climate warming is compressing and shifting these windows:

  • Temperature projections for India show increases of 0.7-2.0 degrees Celsius by the 2030s and 3.3-4.8 degrees Celsius by the 2080s, with the increase being more pronounced during the rabi season. [Various CMIP6 projection studies]
  • For Odisha specifically, research has assessed near-future (2026-2050) climate change impacts on water footprint and carbon footprint of farm-level kharif rice production for locally grown varieties (Khandagiri, Lalat, Swarna) under different climate scenarios. Results indicate increasing water stress and yield instability. [Springer Nature, Environmental Monitoring and Assessment, 2023]

Other crops and heat sensitivity:

Beyond rice, heat stress affects the broader agricultural system:

  • Wheat: A 1 degree Celsius rise in temperature can reduce wheat yields by 5.2%. Terminal heat stress during grain filling is particularly damaging, and rabi wheat in Odisha’s western districts faces increasing risk from premature warming in February-March. [ScienceDirect, Impact of terminal heat stress on wheat yield, 2019]
  • Pulses: Chickpea (chana) and lentil are sensitive to temperatures above 35 degrees during flowering. These are critical rabi crops in western Odisha that provide both protein and income diversification.
  • Vegetables: Tomato, brinjal, and leafy vegetables suffer at sustained temperatures above 40 degrees --- flower drop, reduced fruit set, and accelerated wilting. Kitchen garden production, which supplements household nutrition in rural areas, collapses during heat waves.
  • Night temperatures matter: Recent research highlights the emerging risk from high nighttime temperatures, which prevent the plant from recovering metabolically from daytime heat stress. Short-term high nighttime temperatures pose a risk to rice grain failure that is independent of daytime maximum temperatures. [ScienceDirect, Short-term high nighttime temperatures pose emerging risk to rice, 2021]

Irrigation Deficit as Amplifier

The irrigation gap is the critical variable that determines whether heat stress translates into crop failure:

  • Odisha’s Irrigation Potential Created (IPC) stands at 74.2 lakh hectares, equivalent to ~80% of gross cropped area (GCA = 92.8 lakh ha) — but Irrigation Potential Utilised (IPU) is only 62.5%, meaning roughly 37.5% of created capacity goes unused due to canal degradation, distributary failures, and field-channel gaps (Economic Survey 2025-26, Ch. 3 §3.5). The State’s Vision 2036/2047 targets raise irrigation coverage to 90 per cent (Ch. 3 §3.3). Micro-irrigation (drip/sprinkler) covers only ~23,207 ha — about 2% of GCA — with a 25% target by 2047.
  • Groundwater accounts for only 13% of irrigation in Odisha, compared to over 50% nationally --- leaving the state heavily dependent on monsoon rainfall and surface water systems. [ResearchGate, Ground water based irrigation in Odisha]
  • Western Odisha districts --- the heart of the heat belt --- are the most rain-dependent for agriculture.
  • The contrast with Punjab (approximately 98% irrigated) is instructive: Punjab can absorb temperature increases because irrigation provides a buffer. Western Odisha has no such buffer --- when heat intensifies and rainfall declines simultaneously, there is no backstop.
  • Small landholding size (most farmers in Odisha hold marginal plots) makes investment in modern irrigation technologies like drip systems economically unviable for individual farmers. [Various sources on Indian agriculture]

Livestock and Animal Husbandry

Heat stress on cattle has direct economic consequences for Odisha’s rural economy:

  • Milk production decreases as heat stress increases: mild heat stress reduces output by approximately 1.1 kg/day; moderate to severe heat stress by approximately 4 kg/day. [PMC, Effects of heat stress on body temperature, milk production, 2019]
  • Physiological responses include elevated respiration rate, reduced feed intake, and reproductive dysfunction. The foremost reactions are increases in respiration rate, rectal temperature, and heart rate. [PMC, Impact of heat stress on health and performance, 2016]
  • Global projections indicate significant impacts on cattle production throughout the 21st century due to rising temperatures, with South Asia among the most affected regions. [Lancet Planetary Health, Impacts of heat stress on global cattle production, 2022]

The Heat-Crop Failure-Migration Chain

The sequential logic is direct: heat waves damage standing crops or prevent planting, crop failure eliminates the primary income source for marginal farmers, and without income or food security, seasonal migration becomes the only survival strategy. This chain links Section 5 directly to Section 12 on the migration-heat connection.

6. Labor Productivity

The Scale of India’s Outdoor Labor Economy

India’s economy is exceptionally exposed to heat stress. As of 2017:

  • Heat-exposed work produces approximately 50% of GDP
  • It drives approximately 30% of GDP growth
  • It employs approximately 75% of the labor force --- some 380 million people

[McKinsey, Will India get too hot to work?, 2020]

Productivity Loss Projections

ILO estimates (2019):

  • India is projected to lose 5.8% of working hours in 2030, a productivity loss equivalent to 34 million full-time jobs, due to global warming. [ILO, Working on a Warmer Planet, 2019]
  • Agriculture and construction together will account for 79% of working hours lost (60% and 19% respectively). [ILO, 2019]
  • India accounts for almost half of the global total labor losses from heat stress --- over four times the losses of the second-worst-hit country (China). [ClimateChangePost, 2022]

McKinsey estimates (2020):

  • Lost labor hours due to increasing heat and humidity could put approximately 2.5-4.5% of GDP at risk by 2030, equivalent to roughly $150-250 billion. [McKinsey, 2020]
  • The number of daylight hours during which outdoor work is unsafe will increase approximately 15% by 2030. [McKinsey, 2020]
  • By 2050, some parts of India could effectively lose nearly 30% of annual daylight working hours. [McKinsey, 2020]

Lancet Countdown (2024):

  • In 2024, heat exposure led to 247 billion potential labor hours lost in India, with an estimated income loss of $194 billion. [Lancet Countdown India Data Sheet, 2024]

Sector-Specific Impacts in Odisha

Construction: India may become too hot for construction work during peak hours by the 2030s. Construction workers --- who cannot simply move their work indoors --- face the most direct threat. [McKinsey via Global Construction Review, 2020]

Brick kilns: Brick kiln work in India and specifically in Odisha involves extreme heat exposure from both atmospheric temperatures and radiant heat from furnaces:

  • Male brick molders experience productivity losses of 3.75 to 6.56% per 1 degree Celsius rise in WBGT across work hours. Female molders experience losses of 5.55 to 6.48% per degree. [Wiley, The future of decent work: Forecasting heat stress in India’s brick kilns, 2025]
  • Approximately 60,000 people die annually while working at construction and brick kiln sites nationally, with heat as a contributing factor. [Business & Human Rights Resource Centre]
  • Kiln workers face the double blow of rising atmospheric temperatures and radiant furnace heat, while working 12-hour shifts with inadequate water, sanitation, and rest facilities. [Various sources on brick kiln conditions]

Mining: Odisha’s mining sector --- coal, iron ore, chromite, bauxite --- involves significant outdoor and underground heat exposure. The Angul-Talcher and Ib Valley coalfield regions experience both atmospheric heat and the industrial heat island effect from mining operations and thermal power generation. [Springer Nature, Industrial heat island study, 2020]

Agriculture: Agricultural workers in western Odisha work during the hottest months (April-June) for land preparation and early kharif sowing, precisely when temperatures are most dangerous.

MGNREGA and Heat

The Odisha government has mandated restrictions on outdoor work:

  • 11 AM to 3 PM outdoor work ban during the heat season (April 1 to June 15), applicable to government departments, central government offices, private establishments, industries, commercial institutions, shops, and contractors. [Sambad English, 2025; Kalinga TV, 2025; Pragativadi, 2025]
  • Employers must provide safe drinking water, shaded rest areas, basic medical facilities, and ORS packets at worksites. [Odisha Labour Department guidelines]
  • For MGNREGA work specifically, heat restrictions reduce effective working hours during the most critical period of the agricultural lean season --- precisely when employment guarantee is most needed.

The Informal Sector Worker

The regulations, while important, have a structural limitation: they primarily reach formal and semi-formal employment. The vast informal sector --- agricultural laborers, construction helpers, street vendors, domestic workers, and migrant laborers --- operates largely outside regulatory reach. Informal workers’ net earnings in Delhi drop by 40% during heatwaves; comparable or greater drops are likely in Odisha’s hotter western districts. [Perry World House, Impact of Heat Stress on Labor Productivity, UPenn]

7. Drought and Water Stress

KBK: India’s Chronic Drought Region

The Kalahandi-Bolangir-Koraput (KBK) region --- eight districts in western and southwestern Odisha (Kalahandi, Bolangir, Koraput, Nuapada, Malkangiri, Rayagada, Nabarangpur, and Sonepur) --- has been India’s most recognized chronic drought and poverty zone for decades.

Drought History

  • 1965 mega drought: Migration from western Odisha increased significantly after this event, which marked the beginning of large-scale seasonal out-migration from the region. [ResearchGate, Conceptualizing Dadan Migration, 2025]
  • 1985-1996 starvation crisis: Kalahandi gained national and international attention in the 1980s and 1990s due to recurring starvation deaths during drought years. In 1996, the Government of India declared Kalahandi one of 41 districts “prone to starvation.” [Down To Earth; OpenGlobalRights]
  • 2015-16 drought: A devastating drought affected 27 out of 30 districts in Odisha. Food grain production was projected to drop by more than 43%. Crop area of 21.6 lakh hectares was affected, with at least 14.82 lakh hectares in 233 blocks across 27 districts suffering losses over 33%. By mid-March 2016, the official number of farmer suicides since kharif 2015 had reached 174. [SANDRP, Odisha Drought Profile 2016; Sphere India; Outlook India]

Rainfall Decline

Against an expected rainfall of 1,174 mm between June and September, Balangir district received:

  • 857.9 mm in 2015 (27% deficit)
  • 866.1 mm in 2016 (26% deficit)
  • 779.6 mm in 2017 (34% deficit)

[SANDRP, Odisha Drought Profile 2016]

Long-term (1990-2022) precipitation trends show a declining trend in the southwestern part of Odisha including Kalahandi and Bolangir in all non-monsoon months. [Springer Nature, Spatiotemporal rainfall trend analysis and drought identification, 2025]

Groundwater Depletion

Western Odisha’s groundwater crisis is intensifying:

  • The state’s development plans are heavily dependent on groundwater for both drinking water and irrigation in drought-prone areas, but grassroots facts reveal dwindling water levels, groundwater sources going dry, and groundwater quality deterioration. [RCDC, Water Resources of Odisha]
  • Western districts including Bolangir and Kalahandi are experiencing deterioration of both groundwater quality and quantity. [Springer Nature, Identifying susceptible groundwater contamination zones, 2024]
  • Summer water scarcity makes water sources one of the most contested spaces in villages. [EPW, Summer Water Woes in the KBK Region, 2025]
  • Recharge potential of wells is decreasing, accelerated by both reduced rainfall and increased extraction during heat-induced drought periods. [Various sources]

The Drought-Migration-Remittance Cycle

Drought in the KBK region follows a predictable economic cycle:

  1. Monsoon failure or deficit --- kharif crop (primarily rice) damaged or destroyed
  2. No rabi crop possible --- insufficient soil moisture and no irrigation infrastructure for winter planting
  3. Agricultural income collapses --- marginal farmers who depend on a single crop cycle have zero income for 8-10 months
  4. Dadan recruitment accelerates --- sardars offer advance payments (typically Rs 5,000-15,000) to families desperate for cash
  5. Seasonal migration --- families depart for brick kilns, construction sites, and textile mills in other states
  6. Remittances --- workers send back money that sustains the village economy during the lean season
  7. Return before monsoon --- workers return for kharif planting if they can, repeating the cycle

This cycle has been repeating since at least the 1965 mega drought and has intensified with each subsequent drought event. The remittances from migration now constitute a significant portion of the rural economy in western Odisha, creating a dependency that makes it difficult to break the cycle even when structural alternatives become available.

From Starvation to Surplus: The PDS Transformation

An important counter-narrative: the KBK region’s starvation crisis has been largely (though not entirely) addressed through PDS reform:

  • In 2008, the government universalized the Public Distribution System in KBK’s 8 districts, eliminating the targeted approach that had excluded many of the poorest. [PMC, Universal food security program and nutritional intake, 2016]
  • By 2020, the KBK corridor recorded a food surplus. Kalahandi is now the second-largest producer of rice in Odisha. [The Print, Hunger deaths to rice bowl, 2020]
  • However, universalization of PDS addresses food access, not the underlying climate and economic vulnerabilities that caused the crisis. Drought still destroys livelihoods even when it no longer causes direct starvation.

8. Urban Heat Island

Bhubaneswar-Cuttack Twin City

The Bhubaneswar-Cuttack metropolitan area is rapidly developing an urban heat island effect:

Measured UHI intensity:

  • Annual nighttime surface urban heat island (SUHI) for Bhubaneswar: 0.75 +/- 0.08 degrees Celsius, growing at 0.18 +/- 0.07 degrees Celsius per decade. [Springer Nature, Spatio-temporal evolution of SUHI over Bhubaneswar-Cuttack, 2023]
  • Annual nighttime SUHI for Cuttack: 1.22 +/- 0.07 degrees Celsius, growing at 0.13 +/- 0.07 degrees Celsius per decade. [Springer Nature, 2023]
  • While daytime temperatures have seen some localized cooling effects, nighttime temperatures have risen significantly, with urban areas trapping heat and remaining warmer than surrounding rural areas. [Springer Nature, 2023]

Land use changes driving UHI:

  • In Bhubaneswar, built-up area increased by 38 square kilometers while vegetation decreased by 13.9 square kilometers between 1990 and 2020. [ResearchGate, Urban growth dynamics and its influence on land surface temperature, 2025]
  • Agricultural land and vegetation cover has been continuously decreasing across three decades. [CWE Journal, Urban Heat Island Dynamics, 2025]
  • Catastrophic events --- the 1999 Super Cyclone and Cyclone Fani (2019) --- destroyed massive tree cover, fundamentally altering the city’s thermal properties. Bhubaneswar lost a significant portion of its urban canopy in these two events, and replanting has not kept pace with urbanization. [Various sources]

Temperature trends:

  • Bhubaneswar’s air temperature changes over 123 years (1901-2023) show a clear warming trend. [Nature, Scientific Reports, 2025]
  • Annual temperature variance: 0.124 degrees Celsius (summer), 0.293 degrees Celsius (winter), with surface temperature variations of about 3.71 degrees Celsius (summer) and 8.80 degrees Celsius (winter) across the urban area. [ScienceDirect, Delineating climate change impacts, 2024]

Slum Populations and Heat Vulnerability

Bhubaneswar’s slum population faces disproportionate heat exposure:

  • Approximately 23.1% of Odisha’s population lives in slums. In the twin cities, 301,611 people were residing in slum areas as of 2011. [Various sources on Odisha demographics]
  • 50% of slum houses have tin or asbestos roofing compared to only 3% in non-slum areas. These materials absorb and radiate heat, turning dwellings into ovens during summer. [PMC, Vulnerability and Adaptation to Extreme Heat in Odisha, 2020]
  • 28% of slum houses have mud walls and 49.8% use grass, wood, thatch, or metal sheeting for roofing --- temporary materials that provide no thermal insulation. [PMC, 2020]
  • Only two-thirds of slum houses have electricity, and of those, nearly 65% experience power cuts during summer --- precisely when electricity for fans is most needed. [PMC, 2020]
  • Use of cooling mechanisms (fan, air conditioner, cooler) decreases the chance of heat illness by 60%, but most slum residents lack access to these. [PMC, 2020]
  • Slum residents are dependent on water and traditional cooling methods, while non-slum residents can afford personal protection and architectural modifications. [PMC, 2020]

Other Urban Centers

Sambalpur, Rourkela, and Jharsuguda are growing urban centers in the western heat belt. While specific UHI studies for these cities are limited, they face the compound challenge of both extreme ambient temperatures and urbanization-driven heat amplification. Rourkela, as an industrial city (Rourkela Steel Plant), adds industrial heat to the urban heat island equation.

9. Health Infrastructure and Heat

Hospital Capacity

Odisha’s rural health infrastructure faces structural limitations that become critical during heat waves:

  • Over 10% of PHCs (Primary Health Centres) function without electricity. This is not a minor infrastructure gap --- it means no fans, no cold storage for medications, no functioning diagnostic equipment, and no ability to cool heat stroke patients. [Factly.in; PLOS One, Reduced health services at under-electrified primary healthcare facilities, 2021]
  • PHCs without electricity show a 64% decrease in deliveries and a 39% decrease in in-patient admissions --- indicating that health service capacity collapses when power is unavailable. [PLOS One, 2021]
  • More than 80% of PHCs without electricity lack basic functional equipment including vaccine refrigerators, deep freezers, and other essential devices. [PLOS One, 2021]
  • Odisha has a significant shortfall of 298 doctors at PHCs as of 2022. [Rural Health Statistics, 2021-22]
  • Less than half the PHCs in Odisha have 4 beds, falling short of minimum infrastructure requirements. [Various health infrastructure reports]

The Heat Stroke Treatment Paradox

Heat stroke is a medical emergency with a narrow treatment window. Core body temperature must be reduced rapidly --- ideally to below 39 degrees Celsius within 30 minutes of presentation --- to prevent organ damage and death. This requires:

  • Cold intravenous fluids --- refrigerated saline
  • Ice baths or cold water immersion --- requires reliable water supply and ice
  • Air-conditioned treatment rooms --- to prevent re-heating
  • Monitoring equipment --- for core temperature, cardiac function, and organ function
  • Trained staff --- to recognize and treat heat stroke versus less severe heat exhaustion

Many rural health centers in western Odisha’s heat belt lack all of these capabilities:

  • Consistent electricity for cooling systems (over 10% lack electricity entirely)
  • Adequate water supply for ice preparation (in areas where water itself is scarce during summer)
  • Staffing levels to manage surge admissions during heat events (298 doctor vacancies at PHC level statewide)
  • Transport infrastructure to move severe cases to district hospitals (roads in many western districts are poor; ambulance response times can exceed the critical treatment window)
  • Refrigeration for medications --- heat itself degrades stored drugs in un-cooled facilities

Starting from 2024, additional focus has been placed on developing dedicated “heatstroke rooms” in public health facilities, CHCs, sub-district, and district hospitals. [NCDC/MoHFW, Strengthening Health Systems Preparedness for Heat Related Illnesses, 2024]

Vulnerable Populations

Heat mortality is not evenly distributed across the population. The most vulnerable include:

  • Elderly living alone: As younger family members migrate for work, elderly residents in western Odisha villages lack caregivers who might recognize early symptoms of heat exhaustion. Many live in mud-walled, tin-roofed houses without fans.
  • Outdoor laborers: Agricultural workers, construction laborers, and MGNREGA workers who cannot avoid midday exposure despite government advisories.
  • Pregnant women: Heat exposure during pregnancy increases risks of pre-term birth, low birth weight, and stillbirth. In a region where maternal mortality is already elevated, heat adds another risk factor.
  • Children under 5: Thermoregulation is less effective in young children. Dehydration sets in faster.
  • People with chronic conditions: Cardiovascular disease, diabetes, and kidney disease all lower heat tolerance. In areas where management of chronic conditions is already poor due to health system limitations, heat waves trigger acute crises.
  • Migrant families in transit: Families traveling to or from dadan labor sites during the hot season are exposed during transit, often in non-air-conditioned buses or trains.

OSDMA: The Cyclone-Heat Asymmetry

The Odisha State Disaster Management Authority (OSDMA) is justly celebrated for transforming Odisha’s cyclone response --- from 10,000 deaths in the 1999 Super Cyclone to 64 deaths in Cyclone Fani (2019), a stronger storm. This is one of the most successful disaster management stories globally.

But the institutional architecture that works brilliantly for cyclones has not been replicated for heat:

Cyclone preparedness (well-developed):

  • 936 multipurpose cyclone/flood shelters built across 25 districts, with 122 alert siren towers linked to 1,205 villages, 20 ODRAF units (+10 new approved), and round-the-clock SEOC/DEOC monitoring (Economic Survey 2025-26, Ch. 7 §7.7)
  • 1.2 million people evacuated for Cyclone Fani
  • Satellite monitoring, real-time tracking, systematic evacuation protocols
  • Annual mock drills in all 30 districts
  • International recognition and awards

Heat preparedness (developing but much weaker):

  • Heat Action Plan exists since 2020 but lacks the institutional depth of cyclone response [OSDMA, Heat Action Plan 2020]
  • Recent MoU signed with the Council on Energy, Environment and Water (CEEW) to develop comprehensive heat action plans for 10 districts including Angul, Boudh, Cuttack, Jharsuguda, Sambalpur, and Titlagarh. [OSDMA; The Week, 2024]
  • No equivalent of cyclone shelters for heat (cooling centers at scale)
  • No equivalent of mass evacuation protocols (you cannot evacuate people from heat --- you need to cool them where they are)
  • Advisory-based rather than infrastructure-based response
  • Significantly less funding and institutional investment compared to cyclone management

National Context

The National Disaster Management Authority (NDMA) has issued guidelines on heat wave management, but these remain advisory rather than enforceable. The gap between guidelines on paper and implementation on the ground --- particularly in the poorest districts of western Odisha --- remains wide.

10. Adaptation Measures

What Ahmedabad Did: The Model

Ahmedabad launched South Asia’s first municipal Heat Action Plan (HAP) in 2013, in partnership with NRDC and the Indian Institute of Public Health Gandhinagar:

  • Early warning system linked to IMD forecasts
  • Cool roof initiative: Reflective paint and white tiles on roofs in slum areas to reflect sunlight and reduce indoor temperatures without air conditioning
  • Water distribution: Tanker trucks delivering drinking water to slum areas; community drinking water stations
  • Work hour adjustments: Outdoor labor and school hours modified during heat waves; traffic signals closed 1-4 PM
  • Public awareness: IEC campaigns in multiple languages
  • Impact: Research credits the Ahmedabad HAP with averting approximately 1,190 deaths per year since implementation. [Exemplars in Global Health; NRDC; PMC, Development and Implementation of South Asia’s First Heat-Health Action Plan, 2014]

Ahmedabad’s HAP now serves as a standard template for cities and states across India and internationally.

What Odisha Has Done

  • Heat Action Plan (2020, updated 2022): State-level framework for coordination, implementation, and evaluation of heat wave response. [OSDMA; Global Heat Health Information Network]
  • Outdoor work ban (11 AM-3 PM): Annual directive from April 1 to June 15, applicable to government and private sector employers. [Odisha Labour Department, 2025]
  • Healthcare preparedness directives: CDMOs, SDMOs, and PHC/CHC staff directed to remain prepared for heat-related cases. ORS distribution, drinking water provision at worksites mandated. [Various government notifications]
  • Partnership with CEEW: For developing district-specific heat action plans for 10 high-vulnerability districts. [OSDMA, 2024]
  • Climate Change Cell: Odisha’s Climate Change Cell has developed the State Action Plan on Climate Change (2021-2030) with eleven sectoral missions. [Odisha Climate Change Cell]
  • Tree planting programs: Various government and NGO-led tree plantation initiatives, though primarily monsoon-focused and not specifically designed as heat mitigation. [SankalpTaru, Sabuja Odisha project; various]

Odisha Climate Change Action Plan (SAPCC 2021-2030)

Odisha was among the first Indian states to formulate a comprehensive State Action Plan on Climate Change, identifying eleven sectoral missions:

  1. Agriculture
  2. Coast and Disaster
  3. Energy
  4. Fisheries and Animal Resources
  5. Forests
  6. Health
  7. Industries
  8. Mining
  9. Transport
  10. Urban
  11. Water Resources

[Odisha Climate Change Cell, SAPCC 2021-30]

The plan acknowledges climate vulnerability across these sectors but implementation faces the same structural challenges that affect all Indian state-level climate plans: limited budgets, competing priorities, weak inter-departmental coordination, and the difficulty of translating long-term climate targets into immediate bureaucratic action.

The Gap

The fundamental asymmetry remains: Odisha invested decades of institutional energy, political capital, and funding into cyclone preparedness after 1999. The result was a world-class system. No comparable institutional commitment exists for heat, despite the fact that heat kills more people in Odisha over time than cyclones do in the post-OSDMA era.

The reasons for this gap are structural:

  • Visibility: A cyclone is a discrete, photogenic event --- satellite images, destroyed buildings, dramatic rescue operations. Heat kills invisibly --- one person at a time, in homes and fields, recorded as cardiac arrest or “natural causes.”
  • Geography: Cyclones hit the coast, where Odisha’s administrative capacity, media presence, and political power are concentrated. Heat kills in the interior, in the poorest districts with the weakest institutions.
  • Temporality: A cyclone demands emergency response over days. Heat requires sustained structural adaptation --- housing, water systems, healthcare, electricity, economic alternatives --- over years.
  • Attribution: A cyclone death is unambiguous. A heat death requires medical determination that is often unavailable.

What Would Close the Gap

Following the Ahmedabad model and adapting it to Odisha’s context would require:

  1. Cool roof programs at scale across western Odisha’s villages and urban slums --- not just Bhubaneswar
  2. Rural cooling centers --- shaded, ventilated public spaces with water access --- in every panchayat of the heat belt
  3. Reliable electricity in PHCs --- heat stroke treatment requires cooling capacity
  4. Water infrastructure investment --- drought and heat are inseparable; solving one without the other is futile
  5. Economic alternatives to outdoor labor during peak heat months --- this connects to the migration question
  6. Real-time heat surveillance analogous to cyclone tracking --- district-level WBT monitoring with automated alerts

11. Climate Projections

IPCC AR6 and Post-AR6 Updates

The IPCC Sixth Assessment Report (AR6, 2021) and subsequent research provide the framework for understanding Odisha’s climate future:

Temperature projections for India:

  • Additional warming of approximately 1.2-1.3 degrees Celsius by mid-century (2050) under SSP2-4.5 (moderate emissions), relative to 1995-2014 baseline. [PLOS Climate, Post-AR6 update, 2024]
  • Under a high-carbon pathway, temperatures could increase by 1.8 degrees Celsius by 2050; under a low-carbon pathway, 1.2 degrees Celsius. [World Bank Climate Change Knowledge Portal]
  • By the end of the century, eastern India including Odisha faces warming of 3-5 degrees Celsius under high-emissions scenarios. [Various CMIP6 projections]

Odisha-specific projections (Climate Impact Lab, 2019):

  • Average summer temperature rising from 28.87 degrees Celsius (2010) to 32.19 degrees Celsius (2100) --- an increase of 3.32 degrees, higher than the national average increase. [Climate Impact Lab / Tata Centre for Development]
  • Extremely hot days increasing 30-fold from 1.62/year (2010) to 48.05/year (2100) under high emissions. [Climate Impact Lab]
  • Heat-related mortality increasing by 42,334 deaths per year by 2100 under high emissions. [Climate Impact Lab]

Heatwave projections:

  • The length of heatwaves in India is projected to increase by 2,515% over the next 30 years, driving heat-related deaths 25 times higher than 1990 levels. [G20 Climate Risk Atlas]
  • Marine heatwave days are projected to rise from approximately 20 days/year historically (1970-2000) to nearly 200 days/year by mid-century, affecting fisheries along the Odisha coast. [G20 Climate Risk Atlas]
  • The frequency of hot days is increasing at 5.1 days per decade in Odisha, and this rate itself is accelerating. [IMD data]

Rainfall Projections

  • Mean southwest monsoon rainfall has declined by 0.5-1.5 mm per day every decade over the Indo-Gangetic plains and northeast India during 1951-2024. [PLOS Climate, 2024]
  • Heavy rainfall is projected to become more frequent and more intense at all warming levels (1.5, 2.0, and 4.0 degrees), even as mean rainfall may decline in some areas. This paradox means: less total rain, but when it rains, it floods. [IPCC AR6, Chapter 11]
  • For Odisha, this means potential intensification of both drought (longer dry spells) and flood (more intense monsoon events) --- a compound risk that is worse than either alone.

Compound Event Risk

The most dangerous scenario for western Odisha is not any single hazard but the compounding of multiple hazards:

  • Heat + drought: Simultaneous high temperatures and rainfall deficit, amplifying each other’s impacts on agriculture, water, and human health
  • Heat + humidity: Pre-monsoon humidity buildup combined with extreme temperatures pushing toward wet bulb survivability thresholds
  • Drought + flood: Prolonged dry spells followed by extreme rainfall events that run off hardened soil rather than recharging groundwater
  • Heat + air pollution: Industrial emissions from the Angul-Talcher-Jharsuguda corridor combined with heat stress creating respiratory and cardiovascular compound risk

IPCC AR6 explicitly identifies compound extreme events as an emergent risk, with the Indian subcontinent among the most vulnerable regions globally. [IPCC AR6, WG1 Technical Summary]

The Coal Transition as Compound Risk

Odisha’s climate future is entangled with its coal economy. The Angul-Talcher and Jharsuguda-Sambalpur corridors --- already the state’s hottest industrial zones --- face a dual challenge:

  • Angul district: Maximum installed thermal power capacity of approximately 6.7 GW across NTPC and three captive power plants. Coal mining in Angul employs 53,802 people --- 38% formally and 62% informally. Approximately 168,000 people (29% of the district’s entire workforce) are directly employed in coal mining, coal-based industries, and coal transport. [iFOREST, Just Transition in Odisha Report; Carbon Copy]
  • Jharsuguda district: Approximately 5.7 GW installed capacity across 11 plants (eight captive and three utility-scale). [iFOREST]
  • Seven districts (Angul, Dhenkanal, Jajpur, Jharsuguda, Sundargarh, Sambalpur, Kendujhar) are classified as highly significant from an energy transition perspective. [iFOREST]
  • Coal-based thermal power units will start closing after 2025 due to age and inability to meet environmental norms. [iFOREST]
  • Green energy projects (renewable and hydrogen plants) are expected to generate more than 66,000 employment opportunities, but the transition carries significant employment risk for the 69% of coal workers who are informal and have no safety net. [iFOREST]

The compound risk: these coal districts are already among Odisha’s hottest (Talcher regularly records 46+ degrees), and the industrial heat island effect from mining and thermal power generation has measurably contributed to local temperature increases. Coal decline could ironically reduce the industrial heat contribution even as climate change increases ambient temperatures --- but the economic disruption would remove livelihoods from communities already stressed by heat, potentially driving new waves of migration.

What Western Odisha Looks Like in 2050 Under Business-as-Usual

Under SSP5-8.5 (high emissions), western Odisha by mid-century would face:

  • Average temperatures 1.5-2 degrees Celsius higher than today’s already extreme levels
  • Peak temperatures potentially reaching 50-52 degrees Celsius in Titlagarh, Bolangir, Sambalpur
  • Extremely hot days increasing from fewer than 5 per year to 15-25 per year
  • Wet bulb temperatures approaching 33-35 degrees during pre-monsoon humidity buildups --- the zone of physiological danger
  • Rainfall more erratic: longer dry spells with more intense but less frequent monsoon events
  • Groundwater further depleted from both increased extraction and reduced recharge
  • Agricultural viability severely compromised for rain-fed farming --- the dominant mode in western Odisha
  • Labor productivity losses of 25-30% during peak months for outdoor work
  • Potentially 15,000-20,000 additional heat-attributable deaths per year in the state (extrapolating from the 42,334 projection for 2100)

This is not a distant hypothetical. A person born in Odisha today will be 24 years old in 2050.

12. The Migration-Heat Connection

Heat and Drought as Push Factors

The seasonal migration cycle from western Odisha maps directly onto the heat-agricultural calendar:

  • Post-monsoon (October-November): Dadan labor recruitment begins. Sardars (labor contractors) arrive in villages during Nuakhai festival, offering advance payments. Migrant families receive advance money in exchange for agreeing to stay at worksites for six to eight months. [ResearchGate, Conceptualizing Dadan Migration, 2025]
  • Winter (December-March): Migration is underway. Workers are at brick kilns, construction sites, and textile mills across Andhra Pradesh, Telangana, Tamil Nadu, Gujarat, and other states.
  • Summer (April-June): The heat season in western Odisha --- the very period when temperatures cross 45 degrees --- is also the agricultural lean season when there is no work and no income at home.

Scale of Climate-Driven Migration

  • Over 60,000 families (approximately 200,000 individuals) from Bolangir, Nuapada, Kalahandi, Boudh, Sonepur, and Bargarh migrate to neighbouring states annually. An additional 40,000-50,000 move to brick kilns near Cuttack and Bhubaneswar within the state. [Various migration studies]
  • From Ganjam district alone, approximately 700,000 migrants work in Surat’s power loom industry. [Organiser, Odisha Dadan Migration, 2025]
  • In Bolangir alone, over 70,000 people migrate annually post-monsoon due to drought and crop loss. [Down To Earth; various sources]
  • Unofficial estimates put total dadan migration from western Odisha at approximately 300,000 (3 lakh) laborers annually to brick kilns alone. [Various sources]
  • Bolangir and Nuapada are Odisha’s most migration-prone districts, with over 35% of the population migrating each year. [Organiser, 2025]

Climate Migration Recognition

A 2022 analysis by Climate Refugees explicitly identified Odisha’s migrants as climate migrants:

  • The deep-seated causes of migration include seasonal distress, drought, agrarian insufficiency, caste-related marginalization, and exploitative intermediaries --- all exacerbated by rising temperatures and erratic rainfall. [Climate Refugees, Justice for Odisha’s Climate Migrants, 2022]
  • Research from Balangir district indicates that over the past 30 years, there has been an average temperature rise of eight degrees Celsius (likely referring to peak temperature increases, not mean). [PreventionWeb, India: Farmers push back desertification in Odisha]
  • Migration from western Odisha increased significantly after the 1965 mega drought, and each subsequent drought cycle has deepened the migration pattern. [ResearchGate, 2025]

The Dadan System as Climate Adaptation by Default

The dadan labor system --- where sardars advance money to families in exchange for bonded seasonal labor --- functions as a perverse form of climate adaptation:

  • It provides cash advances precisely when drought and heat have eliminated agricultural income
  • It moves people to locations where work exists, away from locations where heat makes outdoor work dangerous
  • It provides subsistence wages during the lean season
  • But it does so through a system of debt bondage, exploitation, and family separation

Workers are predominantly young (72% aged 16-29), work approximately 12-hour shifts, earn Rs 8,000-12,000 per month, and face severe living conditions --- only one in five has access to washrooms. [Various studies on dadan migration conditions]

Government Response to Climate Migration

The Odisha government has taken some steps to address migration, though these remain inadequate relative to the scale:

  • Odia Migrant Labour Help Desks have been established in Andhra Pradesh, Telangana, and Surat (Gujarat), functioning as first points of contact for Odia workers in distress. [Odisha Labour Department]
  • Shramik Sahayta Helpline provides distress assistance to migrant workers. [Odisha Labour Department]
  • Inter State Migrant Workman Act (ISMW) enforcement: The Brick kiln sector in Odisha is governed by specific regulations, but enforcement remains weak. The gap between legal protection and actual working conditions is vast. [Odisha Labour Directorate]
  • Agroforestry interventions in Bolangir and Nuapada have helped some farming families break out of the poverty-migration trap by diversifying income sources beyond rain-fed rice. [CIFOR-ICRAF, 2020]

These measures address the symptoms of climate migration without addressing the structural driver: western Odisha is becoming too hot, too dry, and too economically marginal for its current agricultural economy to sustain its population.

Connection to the Broader SeeUtkal Framework

This environmental research provides the foundation for understanding western Odisha’s migration patterns: heat and drought are not background context --- they are the primary structural drivers. The seasonal migration calendar follows the heat-agricultural calendar with precision. Dadan labor is what climate adaptation looks like when institutional adaptation (cool roofs, irrigation, diversified employment, heat-resilient agriculture) has not been provided.

The question this research raises for the SeeUtkal framework: OSDMA proved that Odisha can build world-class disaster response when institutional will exists. Why has that institutional will not been directed at the slow disaster of heat --- which kills more people cumulatively than cyclones --- in the same way?

The answer likely involves the visibility problem (Section 10), the geography of political power (heat kills in the interior, away from administrative centers), and the fact that heat adaptation requires sustained economic transformation rather than emergency response --- a fundamentally different institutional challenge.

Cross-references within the SeeUtkal research library:

  • The Leaving (full_read/the-leaving/): Chapters 1-3 on migration scale, dadan system, and Surat pipeline --- this environmental research provides the climatic foundation for the push factors documented there.
  • The Long Arc (full_read/the-long-arc/): Chapter 4 on the “Forgotten Harvest” --- Kalahandi as net paddy exporter during famine, the irrigation gap, the Green Revolution bypass --- all directly connected to the drought-heat-agriculture nexus documented here.
  • Delhi’s Odisha (full_read/delhis-odisha/): Chapter 7 on the cyclone and the cheque, and OSDMA --- the asymmetry between cyclone and heat preparedness is a direct extension of the OSDMA institutional analysis.
  • Tribal Odisha (full_read/tribal-odisha/): Chapter 5 on mining and displacement --- the Angul-Talcher and Jharsuguda industrial corridors that create heat islands are the same zones where tribal displacement for mining has been most intense.
  • Women’s Odisha (full_read/womens-odisha/): Chapter 1 on gendered economy --- when men migrate due to heat and drought, women are left managing households, agriculture, and children alone. The feminization of agriculture in western Odisha is inseparable from the climate-migration dynamic.
  • The Churning Fire (full_read/the-churning-fire/): Chapter 4 on the “Inner Fortress” --- OSDMA as proof of dormant institutional capacity. The heat crisis asks: can that capacity be activated for a different kind of disaster?

This research document, alongside the existing reference materials, establishes that western Odisha’s habitability is not a future risk but a present and accelerating crisis. The systems that govern heat, drought, agriculture, migration, poverty, and institutional response are not separate policy domains --- they are a single interconnected system operating under increasing thermal stress.

Sources

Government and Institutional Sources

IMD Heat Wave Definitions

International Reports and Studies

Academic and Peer-Reviewed Research

Desertification and Agroforestry

Migration and Labor Studies

Coal Transition and Energy

News and Media Sources

Data Portals

Cited in

The narrative series that build on this research.