Comprehensive Overview of Climate Change and Its Drivers

The weather feels different now. Summers stretch longer and hotter, monsoons arrive in unpredictable bursts, and places that rarely saw floods or cyclones are suddenly making headlines. What we’re witnessing isn’t just a string of bad weather days, it’s the visible face of a planetary shift known as climate change. Understanding what drives this shift, and why it has accelerated so rapidly in the last two centuries, is the first step toward responding to it with clarity and purpose.

What climate change actually means 🔗

Climate change refers to long-term shifts in global temperatures, rainfall patterns, wind systems, and other elements of the Earth’s climate. It is distinct from weather, which describes day-to-day conditions. When scientists talk about climate change, they are looking at averages and trends over decades and centuries, not whether it rained last Tuesday.

The planet has always experienced natural climate variations. Ice ages have come and gone, volcanic eruptions have cooled the atmosphere, and shifts in the Earth’s orbit have nudged temperatures up and down over tens of thousands of years. What makes the current era different is both the speed and the cause of change. The world is now warming faster than at any point in recorded history, and the evidence points overwhelmingly to human activity as the primary driver. According to the United Nations, fossil fuels account for around 68 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions.

Natural vs human-induced change 🔗

Natural factors such as solar cycles, volcanic activity, and ocean circulation patterns like El Niño still influence the climate. But these alone cannot explain the warming observed since the Industrial Revolution. The IPCC’s Sixth Assessment Report is unambiguous on this point, concluding that human influence has unequivocally warmed the atmosphere, ocean and land since pre-industrial times. The concentrations of major greenhouse gases in the atmosphere today are higher than at any point in the last 800,000 years.

The greenhouse effect and how we broke the balance 🔗

The greenhouse effect itself is natural and necessary. Gases like carbon dioxide, methane, water vapour, and nitrous oxide trap some of the sun’s heat in the atmosphere, keeping the Earth warm enough to support life. Without this blanket of gases, our planet’s average temperature would fall well below freezing.

The problem is that humans have been thickening this blanket at an extraordinary pace. Atmospheric CO2 concentrations in 2022 were about 1.5 times greater than levels recorded in 1850, and carbon dioxide alone is responsible for roughly 80 per cent of the warming influence of all human-produced greenhouse gases since 1990. The more gas we add, the more heat gets trapped, and the more our weather systems, oceans, and ecosystems are thrown off balance.

The main greenhouse gases at work 🔗

Carbon dioxide (CO2) is the largest single contributor and comes primarily from burning coal, oil, and natural gas. Methane (CH4) is a much shorter-lived but far more potent gas, released by livestock digestion, rice cultivation, landfills, and fossil fuel extraction. Nitrous oxide (N2O) largely comes from agricultural fertilisers and manure management. A fourth category, fluorinated gases, includes synthetic chemicals used in refrigeration, air conditioning, and industrial processes. Though smaller in volume, these super-pollutants can be thousands of times more effective at trapping heat than CO2.

The key drivers accelerating climate change 🔗

Climate change is not caused by a single activity but by a web of interconnected human choices. Understanding the main drivers helps identify where interventions are most urgently needed.

Burning fossil fuels for energy 🔗

The extraction and combustion of coal, oil, and natural gas sit at the heart of the crisis. They power our electricity grids, fuel our cars and aircraft, and run our factories. The transport sector alone accounts for nearly a quarter of global energy-related CO2 emissions. Global greenhouse gas emissions grew by 51 per cent from 1990 to 2021, driven largely by the continued expansion of fossil fuel consumption across developing and developed economies alike.

In India, coal still dominates electricity generation, though the share of non-fossil fuel capacity has been climbing steadily. The country’s updated climate targets reflect this transition, with installed non-fossil power capacity having recently crossed a major milestone.

Deforestation and land-use change 🔗

Forests act as the planet’s lungs, absorbing CO2 through photosynthesis and storing carbon in wood, leaves, and soil. When forests are cleared, that stored carbon is released back into the atmosphere. Worse, the land loses its capacity to absorb future emissions.

The IPCC’s Special Report on Climate Change and Land found that net anthropogenic emissions from Agriculture, Forestry and Other Land Use account for about 13 per cent of total net anthropogenic CO2 emissions. Deforestation is particularly troubling because it damages biodiversity, disrupts local rainfall cycles, and leaves communities more exposed to floods and landslides. Each year, roughly 10 million hectares of forest are lost globally, much of it to make way for agriculture, plantations, roads, or settlements.

Agriculture and food systems 🔗

Food production is both a victim and a cause of climate change. Paddy cultivation releases methane, cattle burp it out during digestion, and nitrogen-based fertilisers emit nitrous oxide. Add the energy used for farm equipment, irrigation pumps, cold storage, transport, and packaging, and the food system emerges as one of the largest contributors to emissions.

A peer-reviewed analysis in ScienceDirect notes that the industrial revolution and unrestricted use of fossil fuels are key factors leading to an increase in GHG concentrations in the atmosphere, but agricultural intensification has quietly compounded the problem through expanding livestock herds and fertiliser-heavy cropping systems.

Industrial processes and manufacturing 🔗

Making cement, steel, plastics, chemicals, and textiles requires immense amounts of heat and energy, most of which still comes from burning fossil fuels. Some industrial processes also emit greenhouse gases directly as part of their chemical reactions. Cement production alone is responsible for a notable share of global CO2 emissions, and demand continues to grow as urbanisation accelerates.

Buildings, urbanisation, and lifestyle choices 🔗

Residential and commercial buildings consume a huge portion of the world’s electricity for heating, cooling, lighting, and appliances. As cities expand and incomes rise, air-conditioner ownership has surged, which in turn drives up electricity demand. Urban heat islands, where concrete and asphalt trap heat, amplify local temperature rises and push energy consumption even higher.

Why India sits at the frontline 🔗

India occupies a uniquely difficult position in the climate conversation. On one hand, its per capita emissions remain well below those of industrialised nations. On the other, it is among the most climate-vulnerable countries in the world. Research from the Council on Energy, Environment and Water warns that the frequency and intensity of extreme climate events in India have increased by almost 200 per cent since 2005, with states like Assam, Andhra Pradesh, Maharashtra, Karnataka, and Bihar showing particularly high vulnerability.

The country’s dependence on the monsoon for agriculture, its long coastline, its heavily populated river deltas, and its fragile Himalayan ecosystems all amplify exposure. A study on Himalayan districts observed that average temperatures in India increased by about 0.7 °C between 1901 and 2018, with biophysical and social impacts varying significantly across regions.

The policy response so far 🔗

India’s primary framework for responding is the National Action Plan on Climate Change, launched in 2008 with a set of national missions focused on solar energy, energy efficiency, sustainable habitat, water, Himalayan ecosystems, afforestation, sustainable agriculture, and strategic knowledge. The Department of Science and Technology is tasked with coordinating the National Mission for Sustaining Himalayan Ecosystem and the National Mission on Strategic Knowledge for Climate Change, both of which focus on building scientific and institutional capacity.

More recently, the Union Cabinet approved India’s Nationally Determined Contribution for the period 2031 to 2035, an enhanced pledge under the Paris Agreement. India’s emissions intensity reduced by 36 per cent between 2005 and 2020, and the target has now been raised to 47 per cent by 2035, with the country aiming for net-zero by 2070.

Why understanding the drivers matters 🔗

Naming the drivers of climate change is not an academic exercise. It shapes where governments invest, which industries transition fastest, and how communities prepare for the shocks ahead. A power grid overly dependent on coal demands a different transition strategy than one built around hydropower or solar. A region losing forest cover needs different interventions than one watching its coastline erode.

Climate action rests on three broad pillars: cutting emissions at the source, adapting to impacts that are already unavoidable, and financing the transition for those least able to afford it. Each of these pillars requires a clear understanding of what is causing the problem in the first place. Misdiagnosing the drivers, whether by blaming only lifestyle choices while ignoring industrial emissions, or blaming only rich countries while ignoring domestic coal dependence, leads to policy that misses the mark.

The road ahead 🔗

The science is settled on the broad picture: human activity is the dominant cause of the warming we are experiencing, and the window to limit it to manageable levels is narrowing. Yet within that sobering reality lies a reason for cautious optimism. The same human ingenuity that built the fossil fuel economy is now building renewable grids, electric mobility, climate-smart agriculture, and nature-based solutions at an unprecedented scale. The challenge is accelerating these transitions fast enough to match the pace of the crisis.

What do you think? Which driver of climate change, fossil fuels, deforestation, agriculture, or industrial processes, do you believe requires the most urgent action in your region, and why? And how can governance systems balance the twin goals of economic growth and emissions reduction without deepening inequality for vulnerable communities?

References

1. https://www.un.org/en/climatechange/science/causes-effects-climate-change
2. https://www.eia.gov/energyexplained/energy-and-the-environment/greenhouse-gases-and-the-climate.php
3. https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide
4. https://www.wri.org/insights/4-charts-explain-greenhouse-gas-emissions-countries-and-sectors
5. https://www.ipcc.ch/srccl/
6. https://www.sciencedirect.com/science/article/abs/pii/S004896972403506X
7. https://www.ceew.in/publications/mapping-climate-change-vulnerability-index-of-india-a-district-level-assessment
8. https://www.sciencedirect.com/science/article/abs/pii/S2212420924007003
9. https://dst.gov.in/climate-change-programme
10. https://www.pib.gov.in/PressReleasePage.aspx?PRID=2245209&reg=3&lang=1