Climate Change and Global Warming — Core Concepts

Core Concepts

Climate change refers to long-term shifts in global temperatures and weather patterns, predominantly caused by human activities since the Industrial Revolution. The primary driver is the 'enhanced greenhouse effect,' where increased concentrations of greenhouse gases (GHGs) like CO2, methane, and nitrous oxide, largely from burning fossil fuels and deforestation, trap more heat in the Earth's atmosphere, leading to global warming.

This warming manifests as rising global average temperatures, altered precipitation patterns, more frequent and intense extreme weather events (floods, droughts, heatwaves), sea-level rise, and ocean acidification.

India is particularly vulnerable due to its geography and reliance on climate-sensitive sectors. Its monsoon patterns are becoming erratic, impacting agriculture and water resources. Coastal areas face threats from sea-level rise and cyclones.

India is actively addressing these challenges through national policies like the National Action Plan on Climate Change (NAPCC) and ambitious Nationally Determined Contributions (NDCs) under the Paris Agreement, focusing on renewable energy transition, afforestation, and sustainable development.

International cooperation and climate finance are crucial for India's mitigation and adaptation efforts, emphasizing the principle of 'common but differentiated responsibilities and respective capabilities.

Important Differences

vs Mitigation vs. Adaptation Strategies

Aspect	This Topic	Mitigation vs. Adaptation Strategies
Primary Goal	Mitigation: Reduce greenhouse gas emissions or enhance carbon sinks to slow down or reverse global warming.	Adaptation: Adjust to the actual or expected impacts of climate change to reduce vulnerability and build resilience.
Focus	Addressing the causes of climate change.	Addressing the impacts of climate change.
Time Horizon	Long-term benefits, often with immediate costs.	Immediate to medium-term benefits, addressing current and near-future impacts.
Examples	Transition to renewable energy, energy efficiency, afforestation, carbon capture technologies.	Drought-resistant crops, early warning systems, sea walls, water harvesting, resilient infrastructure.
Scale of Impact	Global impact, as GHGs mix globally.	Local or regional impact, tailored to specific vulnerabilities.
Cost-Benefit	Often high upfront costs, but avoids much larger future damages.	Can be less costly in the short term, but doesn't address the root cause.

Mitigation and adaptation are two complementary but distinct approaches to addressing climate change. Mitigation focuses on preventing or reducing the severity of climate change by cutting greenhouse gas emissions and enhancing carbon sinks, thereby tackling the root causes. Its benefits are global and long-term. Adaptation, conversely, involves adjusting to the unavoidable impacts of climate change that are already occurring or are projected to occur, aiming to reduce vulnerability and build resilience at local or regional levels. Both strategies are essential for a comprehensive and effective global response to climate change, with India pursuing both vigorously through its national action plans and international commitments.

vs Developed vs. Developing Country Responsibilities (CBDR-RC)

Aspect	This Topic	Developed vs. Developing Country Responsibilities (CBDR-RC)
Historical Emissions	Developed: Higher historical emissions, largely responsible for current atmospheric GHG concentrations.	Developing: Lower historical emissions, contributing less to the problem historically.
Current Emissions	Developed: Per capita emissions generally higher, though some have stabilized/decreased total emissions.	Developing: Total emissions are rising due to development needs, but per capita emissions often lower.
Capacity to Act	Developed: Greater financial, technological, and institutional capacity to mitigate and adapt.	Developing: Limited financial, technological, and institutional capacity, requiring support.
Obligations (Kyoto)	Developed: Legally binding emission reduction targets (Annex I countries).	Developing: No binding targets, but encouraged to take action (Non-Annex I countries).
Obligations (Paris)	Developed: Nationally Determined Contributions (NDCs), expected to take lead, provide finance/tech.	Developing: NDCs, expected to increase ambition over time, receive finance/tech support.
Climate Finance	Developed: Obligated to provide financial resources to developing countries.	Developing: Recipients of climate finance for mitigation and adaptation.

The principle of 'Common But Differentiated Responsibilities and Respective Capabilities' (CBDR-RC) is a cornerstone of international climate negotiations, recognizing that all countries share a common responsibility to address climate change but have different capacities and historical contributions to the problem. Developed nations, having historically contributed the most to greenhouse gas emissions and possessing greater financial and technological resources, are expected to take the lead in mitigation and provide support to developing countries. Developing nations, while increasingly contributing to current emissions due to their development imperatives, have lower historical emissions and limited capacity, thus requiring support for their climate actions. This principle underpins the structure of agreements like the Kyoto Protocol and the Paris Agreement, shaping global climate finance and technology transfer mechanisms.

vs Pre-Paris vs. Post-Paris Climate Regime

Aspect	This Topic	Pre-Paris vs. Post-Paris Climate Regime
Legal Nature of Targets	Pre-Paris (e.g., Kyoto Protocol): Legally binding emission reduction targets for developed countries.	Post-Paris (Paris Agreement): Nationally Determined Contributions (NDCs) are nationally determined and non-binding in legal terms, though their submission is legally binding.
Scope of Participation	Pre-Paris: Top-down approach, primarily focused on developed countries (Annex I) with differentiated responsibilities.	Post-Paris: Bottom-up approach, universal participation by all countries (developed and developing) through NDCs.
Differentiation	Pre-Paris: Strict differentiation between Annex I (developed) and Non-Annex I (developing) countries.	Post-Paris: Retains CBDR-RC but with more flexibility; all countries contribute based on their 'highest possible ambition'.
Review Mechanism	Pre-Paris: Compliance mechanisms for binding targets.	Post-Paris: 'Global Stocktake' every five years to assess collective progress towards long-term goals, encouraging ratcheting up ambition.
Long-term Goal	Pre-Paris: No explicit global temperature goal in Kyoto Protocol.	Post-Paris: Explicit goal to limit global warming to well below 2°C, preferably to 1.5°C above pre-industrial levels.
Focus Areas	Pre-Paris: Primarily mitigation (emission reductions).	Post-Paris: Mitigation, adaptation, and finance are given equal importance, with a new focus on 'loss and damage'.

The shift from the pre-Paris climate regime (exemplified by the Kyoto Protocol) to the post-Paris regime (Paris Agreement) marks a fundamental change in global climate governance. The Kyoto Protocol adopted a top-down approach with legally binding emission targets primarily for developed nations, reflecting a strict differentiation. In contrast, the Paris Agreement introduced a bottom-up, universal approach where all countries submit voluntary, nationally determined contributions (NDCs), fostering broader participation while still acknowledging common but differentiated responsibilities. The Paris Agreement also set a clear long-term temperature goal and established a 'Global Stocktake' mechanism for periodic review and ambition enhancement, moving beyond just mitigation to include adaptation and loss and damage.

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