CLIMATE CHANGE AS A PUBLIC HEALTH EMERGENCY: CHALLENGES, POLICIES, AND WAY FORWARD

Why In News?

The World Health Organization identifies climate change as the 21st century's greatest public health threat, as rising temperatures and extreme weather disrupt disease patterns, nutrition, and global livelihoods. 

What is Climate Change?

Climate change refers to long-term shifts in temperatures and weather patterns. 

• While these shifts can occur naturally due to solar activity or volcanic eruptions, the current era of climate change is primarily driven by human activities, specifically the burning of fossil fuels like coal, oil, and gas.

Mechanism: Burning fossil fuels releases greenhouse gases (such as carbon dioxide and methane) that act like a blanket wrapped around the Earth, trapping the sun's heat and raising global temperatures  

Current State: The world is warming faster now than at any point in recorded history. The last decade (2015–2024) was the warmest on record, with the average global temperature reaching approximately 1.45°C above pre-industrial levels in 2023. (Source: WMO)

Why is Climate Change a Public Health Emergency?

Major health organizations, including the WHO, have declared climate change a "health emergency" because it threatens the fundamental pillars of human health: clean air, safe drinking water, nutritious food supply, and safe shelter.

Direct Physical Trauma & Mortality

Extreme Heat: Heat stress is a leading cause of weather-related death. Between 2000 and 2019, approximately 489,000 heat-related deaths occurred annually worldwide. (Source: WHO). 

• In 2023 alone, heat exposure led to a loss of 181 billion potential labor hours in India, significantly impacting livelihoods. (Source: The Lancet)

Natural Disasters: The frequency and intensity of floods, storms, and wildfires are increasing. 

• Between 2030 and 2050, climate change is projected to cause approximately 250,000 additional deaths per year from malnutrition, malaria, diarrhea, and heat stress alone. (Source: WHO)

Spread of Infectious Diseases

Vector-borne Diseases: Warmer temperatures expand the habitat range of mosquitoes and ticks. 

• The climatic suitability for the transmission of dengue fever increased by roughly 46% for Aedes albopictus and 11% for Aedes aegypti between the 1950s and the 2014–2023 period. (Source: The Lancet)

Waterborne Illness: Heavy rainfall and flooding contaminate water supplies, increasing the risk of diseases like cholera, typhoid, and leptospirosis.

Air Quality and Respiratory Health

Pollution: Climate change increases ground-level ozone and particulate matter. In 2021, deaths attributable to PM2.5 from fossil fuel combustion stood at over 2 million globally. (Source: Lancet)

Allergens: Higher temperatures and CO2 levels trigger longer pollen seasons and higher pollen concentrations, worsening asthma and allergies.

Food and Water Insecurity

Malnutrition: Extreme weather events like droughts and floods disrupt food production. 

• In 2020, nearly 98 million more people reported moderate to severe food insecurity compared to the 1981–2010 average due to heatwaves and drought. (Source: WHO)

Nutrient Decline: Rising CO2 levels lower the nutritional value (zinc, iron, and protein) of staple crops like rice and wheat.

Mental Health Crisis

Climate change is a driver of mental health disorders, ranging from "eco-anxiety" to trauma experienced by populations displaced by disasters. 

Disproportionate Impact (Equity)

Those who contribute the least to greenhouse gas emissions—such as children, the elderly, and populations in low-income countries—bear the brunt of the health impacts. 

• For example, heat-related mortality for people over 65 years of age increased by 85% between 2000–2004 and 2017–2021. (Source: WHO)

Why does India face a higher risk?

India is frequently termed a "climate vulnerability hotspot" because it faces a unique convergence of geographic hazards, high population density, and economic reliance on climate-sensitive sectors. 

According to the Germanwatch Climate Risk Index 2026, India ranks as the 9th most affected country globally by extreme weather events between 1995 and 2024.

• The report highlights that India faced over 430 climate disasters—including floods, heatwaves, and cyclones—causing nearly 80,000 deaths and roughly $170 billion in economic losses. 

Coastal Vulnerability: With a coastline of over 7,500 km, densely populated cities like Mumbai, Kolkata, and Chennai are on the frontlines of sea-level rise and intensifying cyclones. 

• Projections indicate a sea-level rise of 0.4–0.8 meters by 2100, endangering 250 million residents. (Source: Climate Risk Index)

Himalayan Meltdown: The Himalayas, the "Third Pole," are warming at a rate higher than the global average. 

• This threatens the flow of major rivers (Indus, Ganges, Brahmaputra) that support hundreds of millions of people, initially causing floods and later water scarcity.

Monsoon Dependence: Indian agriculture, which employs nearly half the workforce, is heavily rain-fed. 

• Erratic monsoons (too much rain in short bursts or prolonged dry spells) directly threaten food security and rural incomes.

What Challenges Prevent an Effective Response?

Despite ambitious targets like achieving net-zero emissions by 2070, several structural barriers hinder India's ability to adapt effectively.

The "Finance Gap"

Scale of Need: Developing countries like India need more funding for adaptation (building sea walls, changing crops) than is currently available. 

• Developing countries, including India, face an urgent need for climate adaptation funding, with requirements expected to reach $310–$365 billion annually by 2035, which is over 12 times current international public flows. (Source: UNEP)

Debt vs Grants: Much of the climate finance comes as loans rather than grants, pushing developing nations further into debt to pay for a crisis they contributed least to.

Infrastructure & Health Systems

Urban Heat Islands: Rapid, unplanned urbanization has replaced green cover with concrete, creating "heat islands" where cities are hotter than surrounding areas. 

Weak Surveillance: There is a lack of comprehensive, local-level data linking specific climate events to health outcomes, which limits the ability of health systems to prepare for outbreaks of diseases like dengue or cholera.

Governance & Coordination

Siloed Approach: Climate action is viewed as the sole responsibility of the Ministry of Environment, whereas it requires deep coordination across ministries like Health, Urban Development, and Agriculture. 

• The Dasra 2026 report notes that funding skews towards mitigation (emissions reduction) rather than adaptation (protecting people), leaving grassroots organizations under-resourced.

What Should be The Way Forward?

To bridge the gap between "ambition" and "survival," the response must shift from a purely environmental approach to a public health and safety imperative.

Integrate Health into All Climate Policies

Every climate investment—whether in transport, housing, or energy—must be evaluated for its health impact. For example, urban planning should prioritize "cool roofs" and green corridors not just to save energy, but explicitly to reduce heatstroke mortality.

Establish a real-time "Climate-Health Surveillance System" that links meteorological data (heat/rain) with hospital admission data to predict and prepare for outbreaks of dengue, malaria, or heat stress.

Secure "Grant-Based" Adaptation Finance

India and the Global South must push for the New Collective Quantified Goal (NCQG) on climate finance to focus on grants rather than loans.

Currently, 58% of adaptation finance comes as debt, forcing nations to pay interest on money borrowed to survive a crisis they did not cause. Replacing this with grants prevents a "climate debt trap". (Source: UNEP)

Localized "Heat Action Plans" (HAPs)

Move beyond generic advisories to "hyper-local" HAPs. This includes triggering early warning systems based on Wet-Bulb Global Temperature (which accounts for humidity) rather than just dry heat, as humidity is the key driver of mortality in India.

Legally mandate "heat breaks" and cool water availability for outdoor laborers (construction, agriculture) during peak hours.

Accelerate "Just" Energy Transition

While expanding solar, India must actively plan for the phase-down of coal without destroying the livelihoods of millions in coal-dependent states like Jharkhand and Odisha.

Invest in battery storage and grid modernization to ensure that renewable energy can actually replace coal power during night peaks, rather than just supplementing it (Source: Climate Action Tracker).

Conclusion

To ensure a liveable future, India must transition from a mitigation-focused strategy to one that treats climate adaptation as a public health priority, securing non-debt financing and resilient infrastructure to protect its most vulnerable populations from escalating environmental threats.  

Source: THE HINDU