How the multidisciplinary nature of environmental studies helps to understand and tackle climate change

Introduction

Climate change is the long-term shift in the earth's temperature and weather patterns that human activity is now driving. It is a problem of physics and chemistry in its causes, of biology and geography in its effects, and of economics, health, technology and public behaviour in its solutions. Environmental Studies, which the DU course opens as a multidisciplinary subject, is the right frame for it.

Why climate change needs many disciplines

• Its causes lie in everyday economic activity: burning coal and oil for power, transport and industry.
• Its effects fall on ecosystems, coasts, farms and human health at the same time.
• Its remedies need technology, money, law and changes in how people live. No one subject can see all three sides, so the problem is understood only when the subjects work together.

What each discipline contributes, with examples

1. Physics and atmospheric science: how the warming works. Most of the sun's energy reaching the earth is absorbed at the surface and re-radiated as heat; greenhouse gases, chiefly carbon dioxide, trap part of it. The greenhouse effect keeps the average surface temperature near 15 °C, about 33 °C warmer than it would otherwise be, and extra carbon dioxide from human activity is now pushing it higher.
2. Chemistry: which gases, and from where. It identifies the gases and their sources. Coal is the world's single largest contributor of greenhouse gases, and methane locked under frozen polar soils could be released as they thaw, speeding up the warming.
3. Biology and ecology: what happens to living systems. Warming shifts habitats and the ranges of plants, insects and crops. Coral reefs are an example: the 1997 El Niño warming in the Pacific killed about a tenth of the world's corals.
4. Geography and earth science: who is exposed. Mean sea level is projected to rise by 9 to 88 cm by 2100, and more than half of the world's people live within 60 km of the sea; low deltas such as the Ganges-Brahmaputra are among the most vulnerable.
5. Agriculture and economics: the cost to livelihoods. Higher temperatures and shifting rains are expected to lower farm output and cut food production in vulnerable regions. Our example: a rain-fed cotton farmer in Maharashtra who loses a crop to a delayed monsoon shows why adaptation (crop insurance, drought-tolerant seed, water harvesting) is an economic question as much as a scientific one.
6. Health sciences: the human toll. More floods and droughts threaten safe water, and diarrhoeal and mosquito-borne diseases may spread; early-warning systems and disease monitoring are part of the response.
7. Engineering and energy technology: cutting emissions. Renewable systems such as hydropower, solar, wind and geothermal use resources that are constantly replaced and usually pollute less than fossil fuels. Our example: rooftop solar panels on a college building in Delhi replace part of the coal-based power it draws.
8. Education and the social sciences: changing behaviour. Public education aimed at personal behaviour, and the training of researchers and health workers, are needed for the world to respond to climate change.

Conclusion

Physics explains the warming, chemistry traces the gases, biology and geography measure the damage, and economics, engineering, health and education design the response. Because Environmental Studies joins these together, it lets us see climate change as one connected problem and choose solutions that are scientifically sound, affordable and socially accepted.