Climate Change & Global Warming: Causes, Effects & India's Role

Understanding Climate Change and Global Warming

Climate change and global warming are interconnected phenomena that represent one of humanity's greatest challenges. Global warming refers to the long-term increase in Earth's average surface temperature, primarily driven by human activities. Since the Industrial Revolution (1750 onwards), global temperatures have risen by approximately 1.1°C. Climate change encompasses broader environmental shifts including altered precipitation patterns, sea-level rise, and ecosystem disruptions. The Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (2021) confirms that human influence on the climate system is unequivocal. For UPSC aspirants, understanding the distinction between these terms is crucial, as examiners frequently test conceptual clarity. The scientific consensus, supported by 97% of climate scientists, underscores anthropogenic (human-caused) climate change. This foundational knowledge forms the basis for understanding India's climate policy framework and international commitments under the UN Framework Convention on Climate Change (UNFCCC).

Primary Causes of Global Warming

Greenhouse gas (GHG) emissions remain the primary driver of global warming. Carbon dioxide (CO₂) concentrations have increased from 280 ppm (pre-industrial) to over 420 ppm in 2023, the highest in 3 million years. Methane (CH₄) and nitrous oxide (N₂O) are potent greenhouse gases with global warming potentials 28-34 and 265-310 times greater than CO₂ respectively, over 100-year periods. India is the third-largest GHG emitter globally, accounting for approximately 7% of global emissions, though per-capita emissions remain significantly lower than developed nations. Coal combustion for electricity generation contributes 40% of India's emissions, followed by agriculture (18%), industrial processes (14%), and transport (11%). Deforestation reduces carbon sinks, with India losing forest cover at concerning rates. The burning of fossil fuels for energy, transportation, and manufacturing, combined with industrial processes and agricultural practices, constitute the major anthropogenic sources. UPSC questions frequently focus on India's sectoral emission breakdown and the role of renewable energy transitions in emissions reduction.

Global and Regional Climate Effects

Climate change manifests through multiple interconnected effects globally and regionally. Sea levels have risen approximately 21 centimeters since 1880, accelerating at 3.4 millimeters annually. Extreme weather events—cyclones, floods, droughts, and heatwaves—have increased significantly. The 2023 Indian summer recorded temperatures exceeding 52°C in several regions. Ocean acidification threatens marine ecosystems and fisheries upon which 3 billion people depend for food security. Glacial melting, particularly in the Himalayas affecting 1.3 billion people across Asia, jeopardizes freshwater availability. Biodiversity loss accelerates with 1 million species facing extinction. Agricultural productivity declines due to changing monsoon patterns, soil degradation, and water stress. For India, the Himalayan region's vulnerability is paramount—approximately 400 million people depend on glacier-fed rivers (Ganges, Brahmaputra, Indus). The IPCC projects India will experience 1.5-2°C warming by 2050, intensifying these impacts. UPSC emphasizes India's climate vulnerability, monsoon disruptions, and their socioeconomic implications for agriculture, health, and migration patterns.

India's Specific Climate Vulnerabilities

India faces disproportionate climate change impacts due to geographical and socioeconomic factors. Agriculture, employing 45% of India's workforce and contributing 18% to GDP, remains highly climate-sensitive. Monsoon irregularities directly affect crop yields and rural livelihoods—delayed monsoons in 2015 triggered severe droughts affecting 330 million people. Coastal regions housing 400 million people face rising seas and cyclone intensification; the 2020 Cyclone Amphan caused ₹12,500 crore in damages. Water scarcity threatens 600 million Indians as glacier melt diminishes summer river flows. The Sundarbans, home to the Bengal tiger and 4.3 million people, face submersion risks. Urban heat islands exacerbate heat stress, with Delhi experiencing 50°C+ temperatures. Health impacts include heat-related mortality, disease vector proliferation (dengue, malaria), and malnutrition from crop failures. India's low per-capita income and limited adaptation capacity compound vulnerability. The NITI Aayog's assessment identifies the Himalayan region, coastal zones, and drylands as climate hotspots. UPSC candidates must grasp how climate change intersects with poverty, food security, and development challenges central to India's policy framework.

India's Climate Policy and International Commitments

India has positioned itself as a climate-conscious developing nation balancing mitigation with development needs. Under the Paris Agreement (2015), India committed to reducing emissions intensity of GDP by 33-35% by 2030 (baseline 2005). The Nationally Determined Contribution (NDC) updated in 2022 targets 50% non-fossil fuel capacity by 2030 and achieving net-zero by 2070. India's renewable energy capacity exceeded 200 GW as of 2024, with a target of 500 GW by 2030. The National Action Plan on Climate Change (NAPCC, 2008) established eight missions including solar energy, sustainable agriculture, and water resource management. The Climate Change Act proposals aim to institutionalize climate action governance. India advocated successfully at COP26 (Glasgow) for 'climate finance' and differentiated responsibilities, emphasizing historical emissions inequality. The Ministry of Earth Sciences and Ministry of Environment, Forest and Climate Change coordinate policy. India's standpoint—developed nations must reduce emissions faster due to historical responsibility—reflects equity concerns. Renewable energy investments reached $16 billion in 2023. UPSC examination frequently tests knowledge of NDCs, international agreements, and India's negotiating positions on climate justice and climate finance from developed nations.