Mitigation

1. Scientific basis and key distinctions

Mitigation addresses the drivers of anthropogenic climate change: emissions of carbon dioxide, methane, nitrous oxide and fluorinated gases, alongside the loss of natural carbon sinks. Major sources include fossil-fuel combustion, industrial processes, agriculture, land-use change and waste. Because carbon dioxide accumulates, warming depends strongly on cumulative emissions rather than only one year’s emissions. A carbon budget estimates the remaining cumulative carbon dioxide emissions compatible with a specified temperature limit and probability.

Mitigation and adaptation are complementary but not interchangeable. Replacing coal-based electricity with low-emission power is mitigation; constructing cyclone shelters is adaptation. Restoring mangroves can serve both purposes by storing carbon and buffering storm surges. A measure should be assessed across its life cycle: electric vehicles eliminate tailpipe emissions, but their overall mitigation benefit also depends on electricity supply, battery production and vehicle use.

Net-zero carbon dioxide means anthropogenic carbon dioxide emissions are balanced by anthropogenic removals over a specified period. Net-zero greenhouse gases cover multiple gases aggregated using an emissions metric and are not identical to net-zero carbon dioxide. Gross emissions must fall substantially; removals cannot credibly substitute for unlimited fossil-fuel use. Similarly, declining emissions intensity means fewer emissions per unit of GDP, but absolute emissions can still rise if economic growth exceeds the intensity reduction.

• Sources release greenhouse gases; sinks remove them from the atmosphere.
• Mitigation potential is the emissions reduction achievable relative to a reference scenario under specified conditions.
• Methane reductions can slow near-term warming, while sustained carbon dioxide reductions are essential for limiting long-term warming.

2. International mitigation governance

The United Nations Framework Convention on Climate Change, adopted in 1992, seeks to stabilise greenhouse gas concentrations at a level preventing dangerous anthropogenic interference with the climate system. Its principles include equity and common but differentiated responsibilities and respective capabilities. The Kyoto Protocol, adopted in 1997, established quantified commitments for specified developed-country parties. Its flexibility mechanisms included emissions trading, Joint Implementation and the Clean Development Mechanism.

The Paris Agreement, adopted in 2015, brings all parties into a nationally determined mitigation framework. Parties communicate successive nationally determined contributions every five years; each successive NDC is expected to represent progression and reflect the country’s highest possible ambition. The agreement creates binding procedural duties, but does not impose an internationally assigned, legally binding emissions quota on every country. Reporting, technical review and the five-yearly Global Stocktake support transparency and stronger collective ambition.

Article 6 permits voluntary cooperation. Article 6.2 addresses cooperative approaches involving internationally transferred mitigation outcomes, while Article 6.4 establishes a UN-supervised crediting mechanism. Corresponding adjustments help prevent the same mitigation outcome from being counted by both transferring and acquiring countries where required. Article 6.8 concerns non-market approaches. Finance, technology transfer and capacity-building are central because developing countries face substantial investment and development constraints.

The first Global Stocktake concluded at COP28 in Dubai in 2023. Its outcome called for contributions to global efforts including tripling renewable energy capacity, doubling the global average annual rate of energy-efficiency improvement by 2030, and transitioning away from fossil fuels in energy systems in a just, orderly and equitable manner.

• The Kigali Amendment to the Montreal Protocol phases down hydrofluorocarbons, many of which are powerful greenhouse gases.
• REDD+ addresses forest-related mitigation in developing countries, including reduced deforestation and forest degradation, conservation, sustainable management and enhanced forest carbon stocks.

3. Major mitigation pathways

Energy-system mitigation combines cleaner electricity with lower energy demand and electrification of suitable end uses. Solar, wind, hydropower and nuclear power can reduce fossil-fuel dependence, although their environmental impacts and system requirements differ. Transmission networks, storage, demand response and flexible operation help integrate variable renewable power. Efficiency in appliances, buildings and industry reduces energy requirements, but rebound effects can partly offset savings when cheaper energy services encourage greater consumption.

Transport mitigation follows an avoid–shift–improve approach: avoid unnecessary motorised travel through compact planning, shift journeys to public transport and non-motorised modes, and improve vehicle efficiency and fuels. Industry requires material efficiency, recycling, process changes, electrification and low-emission hydrogen where appropriate. Cement additionally produces process emissions from limestone calcination, so switching its energy supply alone cannot eliminate all emissions.

Agricultural and land-based options include better nitrogen-fertiliser management, improved livestock and manure practices, suitable water management in rice cultivation, protection of natural ecosystems and restoration of degraded land. Waste-sector measures include segregation, composting, anaerobic digestion and landfill methane capture. Forest carbon storage faces risks from fires, drought, disease and subsequent clearing; monoculture plantations cannot automatically replace biodiverse natural forests.

Carbon capture and storage captures carbon dioxide from sources and stores it durably, usually underground. It is not necessarily atmospheric carbon removal: capturing emissions from a fossil-fuel plant mainly avoids their release. Direct air capture with durable storage and sustainably designed bioenergy with carbon capture and storage can remove atmospheric carbon dioxide. Their effectiveness depends on energy use, land requirements, permanence and full life-cycle accounting.

• Prioritise rapid emissions reductions; use credible removals for residual emissions that are difficult to eliminate.
• Solar radiation modification does not directly reduce atmospheric greenhouse gas concentrations and does not address ocean acidification.

4. India’s mitigation commitments and instruments

India’s updated NDC, submitted in August 2022, commits to reducing emissions intensity of GDP by 45% from 2005 levels by 2030. It also targets about 50% cumulative electric power installed capacity from non-fossil fuel-based energy resources by 2030, with support through technology transfer and low-cost international finance. The NDC retains the goal of creating an additional carbon sink of 2.5–3 billion tonnes of carbon dioxide equivalent through additional forest and tree cover by 2030.

These commitments must be read precisely. Installed capacity is rated generating capability, whereas generation is actual electricity output. Non-fossil power includes nuclear energy as well as renewable energy. India’s 2070 net-zero announcement is a long-term goal, distinct from its quantified 2030 NDC targets. India submitted its Long-Term Low-Emission Development Strategy at COP27 in 2022.

Domestic measures span the National Action Plan on Climate Change, renewable-energy deployment, the Perform, Achieve and Trade scheme for industrial efficiency, UJALA LED lighting, the National Green Hydrogen Mission and electric-mobility support. The Energy Conservation (Amendment) Act, 2022 enabled a carbon credit trading framework. The Carbon Credit Trading Scheme, 2023 provides the framework for the Indian Carbon Market, with compliance and offset mechanisms. Its development should not be confused with an economy-wide emissions cap already covering every sector.

• Mission LiFE promotes resource-conscious lifestyles and demand-side environmental action.
• Green hydrogen is most valuable where it can replace fossil-based hydrogen or help decarbonise difficult-to-electrify activities.

5. Effectiveness, integrity and a just transition

Mitigation policies include emissions standards, public investment, renewable-energy support, carbon taxes and emissions trading. A carbon tax directly sets a price, while a cap-and-trade system limits covered emissions and lets allowance prices emerge through trading. Neither instrument is automatically effective: coverage, enforcement, price signals, institutional capacity and complementary infrastructure matter.

Credible mitigation requires measurement, reporting and verification. Offset projects must demonstrate additionality: reductions or removals should not have occurred without the relevant intervention or incentive. They must also address leakage, permanence, robust baselines and double counting. A low-quality offset can allow an emitter to claim compensation without delivering an equivalent climate benefit.

A just transition protects workers, communities and vulnerable consumers during structural change. For India, coal-dependent districts need economic diversification, worker reskilling and fiscal planning. Clean-energy expansion must also respect land rights, biodiversity and mineral-supply constraints. Effective mitigation therefore combines environmental integrity with energy access, affordability and development rather than treating these goals as mutually exclusive.

• Co-benefits include cleaner air, lower fossil-fuel import dependence and improved public health.
• Assess outcomes using actual emissions reductions, not merely expenditure, installed equipment or announced targets.

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