Global Climate Change — Revision Notes
⚡ 30-Second Revision
- Global warming: ~1.1-1.2°C rise above pre-industrial levels.
- Key GHGs: CO2, CH4, N2O, F-gases.
- CO2 concentration: >420 ppm (pre-industrial ~280 ppm).
- UNFCCC: 1992, foundational treaty, CBDR principle.
- Kyoto Protocol: 1997, binding targets for developed nations, market mechanisms (CDM).
- Paris Agreement: 2015, 1.5°C/2°C target, NDCs, Global Stocktake, Loss & Damage fund.
- India's NDCs (2030): 45% emission intensity reduction (from 2005), 50% non-fossil capacity.
- India's Net Zero target: 2070.
- NAPCC: 2008, 8 national missions.
- COP28 (2023): First Global Stocktake, operationalized Loss & Damage Fund, 'transitioning away from fossil fuels'.
- IPCC: Intergovernmental Panel on Climate Change, scientific body.
2-Minute Revision
Global climate change signifies long-term shifts in Earth's climate, primarily driven by human-induced enhancement of the natural greenhouse effect. Burning fossil fuels and deforestation release excessive greenhouse gases (CO2, CH4, N2O), trapping more heat and causing global warming – an average temperature rise of over 1.1°C since pre-industrial times. This warming leads to diverse impacts: sea-level rise, extreme weather events, and threats to ecosystems and human societies.
International efforts began with the UNFCCC (1992), followed by the Kyoto Protocol (1997) with its binding targets for developed nations. The landmark Paris Agreement (2015) introduced a universal, bottom-up approach through Nationally Determined Contributions (NDCs), aiming to limit warming to 1.5°C. Recent COPs, like COP28, have focused on the Global Stocktake to assess progress, operationalizing the Loss and Damage Fund, and initiating a 'transition away from fossil fuels'.
India is a crucial player, balancing development with climate action. Its NDCs commit to reducing emission intensity by 45% and achieving 50% non-fossil fuel capacity by 2030, with a Net Zero target by 2070. Strategies involve both mitigation (renewable energy, energy efficiency) and adaptation (resilient infrastructure, early warning systems). Understanding the 'Climate-Development Paradox' and the role of climate finance is key to grasping the complexities of global climate action.
5-Minute Revision
Global climate change is the long-term alteration of Earth's climate patterns, predominantly caused by anthropogenic activities intensifying the natural greenhouse effect. The release of greenhouse gases (GHGs) like CO2 from fossil fuel combustion and deforestation, along with CH4 and N2O from agriculture, creates a thicker atmospheric blanket, trapping more heat and leading to global warming.
The planet has already warmed by over 1.1°C, triggering cascading impacts such as accelerated sea-level rise, increased frequency and intensity of extreme weather events (heatwaves, droughts, floods, cyclones), ocean acidification, and significant threats to biodiversity, food security, and water resources.
International governance frameworks, initiated by the UNFCCC (1992), have evolved from the Kyoto Protocol's (1997) top-down, binding targets for developed nations to the Paris Agreement's (2015) universal, bottom-up approach.
The Paris Agreement's core is Nationally Determined Contributions (NDCs), where countries set their own climate action plans, aiming to limit global warming to 1.5°C. Key mechanisms include the Global Stocktake, a periodic review of collective progress, and the Enhanced Transparency Framework.
Recent developments, notably COP28 in Dubai, saw the conclusion of the first Global Stocktake, highlighting insufficient progress, and the historic operationalization of the Loss and Damage Fund to support vulnerable nations facing unavoidable climate impacts, alongside a call to 'transition away from fossil fuels'.
India's climate action is robust, guided by the National Action Plan on Climate Change (NAPCC) with its eight missions. India's updated NDCs commit to a 45% reduction in emission intensity of GDP and 50% non-fossil fuel electricity capacity by 2030, targeting Net Zero by 2070.
Initiatives like the International Solar Alliance (ISA) and the LiFE movement underscore its leadership. Strategies encompass aggressive mitigation through renewable energy expansion (solar, wind, green hydrogen) and energy efficiency, alongside crucial adaptation measures like climate-resilient infrastructure, early warning systems, and climate-smart agriculture.
The 'Climate-Development Paradox' remains central to India's stance, advocating for climate justice and adequate climate finance from developed nations to support its green transition without hindering its developmental aspirations.
Understanding these interconnected facets – science, policy, impacts, and solutions – is vital for a comprehensive UPSC preparation.
Prelims Revision Notes
- Greenhouse Effect & GHGs: — Natural process. Enhanced by human activities. Key GHGs: CO2 (fossil fuels, deforestation), CH4 (agriculture, waste), N2O (fertilizers), F-gases (industrial). GWP (Global Warming Potential) compares potency to CO2. Current CO2 > 420 ppm.
- Global Warming Trends: — ~1.1-1.2°C rise above pre-industrial (1850-1900). 1.5°C target of Paris Agreement. IPCC reports are authoritative sources.
- International Agreements:
* UNFCCC (1992): Framework, CBDR principle. Annual COPs. * Kyoto Protocol (1997): First legally binding targets (developed nations), market mechanisms (CDM, JI, ETS). USA not ratified. * Paris Agreement (2015): Universal, 1.5°C/2°C goal, NDCs (Nationally Determined Contributions - voluntary targets, but submission is binding), Global Stocktake (every 5 years), Enhanced Transparency Framework, Climate Finance ($100 bn goal), Loss & Damage (operationalized at COP28).
- India's Climate Action:
* NAPCC (2008): 8 missions (Solar, Energy Efficiency, Water, Himalayan Ecosystem, Green India, Sustainable Agriculture, Sustainable Habitat, Strategic Knowledge). * NDCs (updated 2022): 45% emission intensity reduction (from 2005 levels by 2030), 50% non-fossil fuel capacity (by 2030), 2.
5-3 billion tonnes CO2 equivalent carbon sink (by 2030). * Net Zero Target: 2070. * Other Initiatives: International Solar Alliance (ISA), LiFE (Lifestyle for Environment) Movement, National Green Hydrogen Mission.
- Mitigation vs. Adaptation:
* Mitigation: Reduce emissions (renewables, efficiency, carbon capture, afforestation). * Adaptation: Adjust to impacts (resilient infrastructure, early warning, climate-smart agriculture).
- Key Terms: — Carbon Sink, Carbon Neutrality/Net Zero, Climate Finance (GCF, Adaptation Fund), Climate Resilience, Climate Justice, Global Stocktake, Loss and Damage.
Mains Revision Notes
- Conceptual Clarity: — Differentiate climate change, global warming, greenhouse effect. Understand anthropogenic drivers (fossil fuels, deforestation, agriculture). Explain feedback loops.
- Impacts (India-specific): — Analyze physical impacts (Himalayan melt, monsoon variability, sea-level rise, extreme weather) and socio-economic impacts (agriculture, water, health, migration, infrastructure). Connect to vulnerability and disaster management.
- International Frameworks (Critical Analysis): — Evaluate UNFCCC, Kyoto, and Paris Agreements. Discuss strengths (universal participation, 1.5°C goal, NDCs) and weaknesses (ambition gap, climate finance shortfall, enforcement). Highlight CBDR-RC and climate justice as core principles. Analyze outcomes of recent COPs (e.g., COP28's Global Stocktake, Loss & Damage Fund, 'transitioning away from fossil fuels').
- India's Strategy (Integrated Approach):
* Mitigation: Detail NDCs, NAPCC missions, renewable energy targets (solar, wind), Green Hydrogen Mission, energy efficiency. Discuss challenges in scaling up. * Adaptation: Explain strategies like climate-resilient infrastructure, early warning systems, climate-smart agriculture, water conservation. Emphasize the need for local-level implementation. * Climate Finance: Discuss India's demand for finance and technology transfer. Analyze the role of GCF and other funds.
- Cross-cutting Themes:
* Climate-Development Paradox: How developing nations balance growth with emission reduction; equity concerns. * Sustainable Development Goals (SDGs): Link climate action to SDG 13 and other related goals. * Economic Implications: Carbon pricing, green economy, job creation in renewables. * Ethical Dimensions: Intergenerational equity, climate justice.
- Answer Writing: — Use an analytical, mentor-like tone. Provide specific data points and examples. Structure answers with clear introduction, body (with subheadings), and conclusion. Integrate current affairs to demonstrate updated knowledge and critical thinking.
Vyyuha Quick Recall
CLIMATE: C - Carbon cycle disruption (Anthropogenic causes) L - Long-term temperature trends (Global warming, 1.5°C target) I - International agreements (UNFCCC, Kyoto, Paris, COPs) M - Mitigation and adaptation strategies (Renewables, efficiency, resilient infra) A - Anthropogenic causes and impacts (Fossil fuels, deforestation, extreme weather) T - Temperature rise projections and targets (IPCC, NDCs, Net Zero) E - Energy transition and renewable solutions (Solar, wind, green hydrogen)