Heat stress cost India $9 per tonne of CO2 in lost labour productivity in 2025
India experienced significant labour productivity losses due to heat stress in 2025. A study revealed that each tonne of carbon dioxide emitted cost India nine dollars. Globally, emissions caused forty-one dollars in lost labour productivity per tonne. Outdoor workers face the greatest exposure to these dangerous heat conditions. Employers and policymakers must mitigate these damages and protect workers.
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Context
A new study reveals the severe economic consequences of climate change, estimating that heat stress will cost India $9 per tonne of CO2 emitted in lost labour productivity by 2025. Globally, the cost is projected at $41 per tonne, making labour the second-largest contributor to the social cost of carbon, trailing only heat-related fatalities. The findings underscore the disproportionate impact of extreme heat on outdoor workers and vulnerable regions, necessitating urgent mitigation and adaptation strategies.
UPSC Perspectives
Economic
The economic ramifications of climate change extend far beyond direct infrastructure damage, deeply affecting the labour market and overall productivity. The concept of the Social Cost of Carbon (SCC) is crucial here; it is an estimate of the economic damages associated with emitting one additional tonne of greenhouse gases into the atmosphere. The study highlights that lost labour productivity is a major component of this cost. In India's context, where a vast portion of the workforce is engaged in the informal sector, agriculture, and construction—often outdoors without adequate cooling infrastructure—the $9 per tonne cost translates into massive economic losses. This directly impacts gross domestic product (GDP) growth and exacerbates poverty. From a UPSC perspective, understanding the SCC is vital for questions related to environmental economics, carbon pricing mechanisms like a carbon tax, and the integration of climate risks into macroeconomic planning and formulations. The widening productivity gap mentioned in the article further stresses the need for structural reforms to protect the workforce while pursuing industrial growth.
Environmental
The study utilizes the Wet-Bulb Globe Temperature (WBGT), a composite index that measures heat stress in direct sunlight, taking into account temperature, humidity, wind speed, sun angle, and cloud cover. Unlike standard temperature readings, WBGT is a more accurate indicator of the physiological stress imposed by heat on the human body, as high humidity impairs the body's ability to cool itself through sweating. As global temperatures rise due to greenhouse gas emissions, periods of extreme WBGT are becoming more frequent and intense. The research points out that damages are concentrated in specific geographic regions, including the Middle East and sub-Saharan Africa, which already face severe climatic challenges. For the exam, aspirants must understand the science behind WBGT and how it relates to climate change projections by organizations like the . Questions in GS 3 often focus on the direct physiological and environmental impacts of global warming, making this metric highly relevant for discussing climate vulnerability and resilience.
Governance
Addressing the health hazards of extreme heat requires robust governance and policy interventions aimed at climate adaptation. The article suggests practical measures such as mandating rest breaks, providing shade and hydration, and shifting strenuous work to cooler hours. These are elements of occupational health and safety regulations that need stringent enforcement, particularly for vulnerable sectors like agriculture and construction. The state's role, guided by (Right to Life, interpreted to include a safe environment and safe working conditions) and (Directive Principles advocating for just and humane conditions of work), is paramount in formulating and implementing at the national, state, and local levels. UPSC mains questions often ask for actionable strategies to mitigate climate impacts; integrating occupational safety standards into broader climate resilience frameworks, perhaps through guidelines issued by the , is a critical governance response to protect the workforce from the escalating threat of heat stress.