Introduction The global climate challenge is often discussed in terms of technologies, global targets, and political commitments. Yet, at its core, mitigation is an economic question: what does it cost to avoid greenhouse gas (GHG) emissions? Understanding the cost of different mitigation options helps governments, development institutions, and investors allocate scarce resources where they generate the greatest climate impact. A useful benchmark is the cost of avoiding one ton of carbon dioxide equivalent (tCO₂e), often referred to as the “abatement cost.” Comparing the Cost of Different Mitigation Options The Intergovernmental Panel on Climate Change and the International Energy Agency have assessed a wide range of mitigation opportunities across sectors. Comparing the costs of different mitigation investments with the emissions they reduce or avoid requires a counterfactual: how many emissions would occur without the investment? This scenario differs across countries. For example, replacing or saving electricity in a country that relies mainly on fossil fuels for power generation will avoid more emissions than doing so in a country with low-carbon electricity. The comparison should therefore be made against what would plausibly happen without the intervention, not against an undefined high-emissions scenario. With appropriate approximations and reasonable assumptions, illustrative cost ranges can be established for different measures. Some measures save money while reducing emissions, whereas others require substantial subsidies, regulations, or carbon prices to become viable. The resulting range extends from negative-cost interventions to technologies costing hundreds of dollars per ton of CO₂ avoided. Low-cost and negative-cost options (-$100/tCO₂e to $20/tCO₂e) Industrial energy efficiency, such as improved motors, waste heat recovery, and process optimization, costs between -$100/tCO₂e and $20/tCO₂e. Savings from reduced energy consumption can exceed the upfront investment. Negative values indicate that the investment can be commercially profitable. Methane leak reduction in oil and gas systems is often among the most attractive investment opportunities because recovered methane can be sold as fuel. Typical abatement costs range from negative values up to about $20/tCO₂e. Such opportunities may nevertheless remain unexploited because of financing constraints, information gaps, implementation capacity, or split incentives—for example, where the investor bears the cost but does not capture all the benefits. Efficient appliances and selected building retrofits also frequently pay for themselves over time through lower electricity bills. Moderate-cost options ($20tCO₂e to $100/tCO₂e) Utility-scale solar power or onshore wind power Avoided deforestation, reforestation and afforestation Energy-efficiency retrofits (e.g., heating, ventilation, and air-conditioning replacement) Keeping economically recoverable coal reserves unexploited How much coal must remain underground to avoid one ton of CO₂? Coal remains the most carbon-intensive major fuel. When burned, its carbon combines with oxygen to produce carbon dioxide. About 0.4 tons of coal corresponds to roughly one ton of CO₂, so each ton left underground avoids approximately 2.5 tCO₂ if the coal would otherwise have been extracted and burned. At current international benchmark prices, the gross market value of the coal corresponding to one ton of CO₂ is roughly $40–$60. This is an illustrative gross-value calculation, not an estimate of marginal abatement cost. The relevant opportunity cost would be the forgone margin after deducting extraction, processing, and transport costs that would no longer be incurred. Any practical decision to leave coal unexploited would also require further analysis of the counterfactual, comparability, energy-system implications, and implementation consequences. Higher-cost and emerging solutions Other options remain more expensive. Industrial decarbonization through green hydrogen, carbon capture, utilization and storage (CCUS), and some forms of transport electrification often exceed $100/tCO₂e. Current estimates frequently range between $100/tCO₂e and $300/tCO₂e depending on technology maturity and local conditions. At the upper end of the spectrum, direct air capture and other engineered carbon-removal technologies can exceed $300/tCO₂e and in some cases, surpass $1,000/tCO₂e. Two Different Types of Mitigation Actions An important distinction is often overlooked in climate discussions: not all emission reductions are pursued for the same purpose. Category 1: Emission reduction as a primary objective Some interventions exist almost exclusively to reduce GHG emissions. Their economic value derives primarily from avoided emissions rather than from the production of another good or service. Examples include carbon capture, utilization and storage, direct air capture, reforestation projects designed primarily for carbon sequestration, paying for coal reserves to remain undeveloped, and methane destruction projects without significant energy recovery. For these measures, the key metric is often the cost per ton of CO₂ avoided or removed. In economic terms, society is directly purchasing climate benefits. Table 1: Illustrative Mitigation Costs by Measure Measure Approx. Cost ($/tCO₂e) Category Industrial energy efficiency -100 to 20 By-product of activity Methane leak reduction -10 to 20 By-product of activity Efficient appliances / retrofits -100 to 20 By-product of activity Onshore wind / utility-scale solar 20 to 80 By-product of activity Avoiding deforestation / reforestation 0 to 100 Primary objective Keeping coal reserves underground ~40 to 60 Primary objective Green hydrogen / CCUS 100 to 300+ Mixed Direct Air Capture 300 to 1,000+ Primary objective CCUS = Carbon capture, utilization and storage, tCO₂e = one metric ton of carbon dioxide equivalent. Sources: Intergovernmental Panel on Climate Change. AR6 Working Group III. Summary for Policymakers. Figure SPM.7: Mitigation Options and Costs; International Energy Agency (IEA). GHG Abatement Costs for Selected Measures of the Sustainable Recovery Plan; IEA, Current and Potential Removal Costs through DAC and BECCS; Global Energy Monitor. Estimating Carbon Dioxide Emissions from Coal Mines; Intercontinental Exchange. API2 Rotterdam Coal Futures; and Trading Economics. Coal Price Benchmark Data. Category 2: Emission reduction as a by-product of economic activity Many mitigation measures, however, serve another primary purpose. Emission reductions occur because the underlying activity is carried out more efficiently or with a lower-carbon technology. Examples include generating electricity from solar or wind instead of coal, producing steel with green hydrogen rather than cooking coal, electrifying public transport, improving building insulation, and installing efficient industrial equipment. In these cases, the objective is not merely to reduce emissions. Society still receives electricity, mobility, housing, or industrial output and the climate benefit is a co-benefit. For such investments, the figure to look at is the incremental cost—the difference between the cost of the low-emission option and that of the more emission-intensive alternative. In practice, however, the total investment cost is often attributed to the emission reduction. This overstates the abatement cost and makes it not directly comparable with the climate benefit of Category 1 measures. The Damage Cost of Climate Change These figures approach the climate cost from the perspective of avoiding emissions. A complementary approach asks what climate damages cost, expressed per ton of CO₂e added to the atmosphere. Economists capture this in the social cost of carbon—the discounted present value of future damages caused by emitting one additional ton of CO₂ today, including impacts on agriculture, human health, labor productivity, coastal infrastructure, or ecosystem services. The logic behind the social cost of carbon follows a clear causal chain: Emissions raise atmospheric concentrations of CO₂ and other GHGs. Higher concentrations trap heat and raise global mean temperature. Higher temperatures alter rainfall, sea levels, and extreme-weather frequency. These physical changes translate into economic losses, such as lower crop yields, heat-related mortality, damaged infrastructure, and slower productivity growth. Dividing aggregate damage from cumulative and projected emissions by the tons of CO₂ that caused it yields a damage cost per tCO₂e. Carbon Pricing as a Benchmark Carbon taxes and emissions trading systems attach a monetary value to each ton of CO₂ released, creating an incentive to reduce emissions. An emitter will reduce emissions when the carbon tax or the price of an emission allowance will be higher that the costs of reducing emissions. These policy prices may be informed by the social cost of carbon, mitigation targets, political priority, or market design, but they are not themselves estimates of climate damages. Carbon prices also differ substantially across regions and are not directly comparable because systems vary in coverage, free allocation, and sectoral exemptions. Table 2: Illustrative Carbon Prices by Jurisdiction, 2026 Carbon Pricing System US$/tCO₂, 2026 European Union ETS 90–100 People's Republic of China National ETS 10–15 United States (federal) 0 California Cap-and-Trade 30–40 Northeastern US (RGGI) 20–30 Singapore carbon tax ~18–20 Indonesia carbon tax floor / ETS ~2 India national carbon market Under development; no market price yet Kazakhstan ETS ~1 ETS = emissions trading system, RGGI = Regional Greenhouse Gas Initiative, tCO₂e = one metric ton of carbon dioxide equivalent. Note: Values are indicative and not directly comparable because systems differ in sector coverage, exemptions, allocation rules, and whether prices are taxes, allowance prices, or prices under development.Sources: World Bank. Compliance Price Map Block; World Bank. State and Trends of Carbon Pricing 2026. World Bank Group; International Carbon Action Partnership (ICAP). Allowance Price Explorer and ETS Factsheets; California Air Resources Board. Cap-and-Invest Program; Regional Greenhouse Gas Initiative. Allowance Prices and Volumes; Singapore National Climate Change Secretariat. Carbon Tax; Indonesian Ministry of Energy and Mineral Resources. 2021. Energy Minister Explains Carbon Tax Schemes. Press Release. 17 November; Indian Carbon Market. 2026. Prakriti 2026: India Launches Carbon Market Portal & Announces Trading to Begin in 4 Months. News Article. 23 March; Reclimatize. 2026. India's Carbon Credit Certificate Market: How CCC Trading Works Under the 2026 CERC Regulations and the Structural Questions That Remain. News Article. 7 April; and Institute for Energy Economics and Financial Analysis. 2025. Asia’s Carbon Markets are Expanding but Undermined by Low Prices. News Article. 18 September. What the Comparison Shows and What It Does Not The comparison is revealing, but the figures need to be interpreted according to what they measure. Energy-efficiency measures often cost less than prevailing carbon prices, while wind and solar power are increasingly competitive within the range of many systems. The $40/tCO₂–$60/tCO₂ figure for keeping coal underground represents the gross market value of the relevant coal rather than a directly comparable marginal abatement cost. Depending on the counterfactual and project-specific analysis, the net opportunity cost could be much lower. By contrast, CCUS and direct air capture remain far more expensive than most existing carbon prices. Even the highest current carbon prices, such as the EU ETS at approximately $90/tCO₂–$100/tCO₂, remain below many estimates of the social cost of carbon of at $120/tCO₂–$190/tCO₂ and above. Although these figures measure different concepts and are not directly comparable, their relative magnitudes suggest that current carbon markets underprice the damage caused by emissions. These relative cost levels help explain both the potential for market-based incentives to mobilize low-cost mitigation opportunities and the need for targeted subsidies, concessional finance, stronger carbon prices, or other policy support where higher-cost technologies are necessary. Conclusion The central economic conclusion is straightforward: mitigation is justified when the marginal cost of avoiding an additional ton of CO₂ is lower than the damage that the emission would otherwise cause. The gap between mitigation costs and estimated climate damages reflects a classic external-cost problem: private actors can benefit from emitting CO₂ while passing part of the resulting costs to society through damage to ecosystems, agriculture, health, and infrastructure. Effective climate policy must therefore align private incentives more closely with these wider social costs. Similar market failures can also be found at the country level. If companies in one jurisdiction must internalize climate-damage costs through carbon pricing or regulations while competitors elsewhere do not, the regulated firms face a competitiveness disadvantage. This creates political pressure to keep national regulation below the social optimum. That pressure is reinforced by a second factor: regulatory costs are visible today, while many avoided climate damages occur later and are spread globally, making it politically easier to defer action. This also points to a broader coordination problem: climate-damage costs are still not adequately reflected in market prices. Where carbon prices and regulations differ sharply across jurisdictions, firms and countries have incentives to shift activity toward places where emissions remain cheaper. Without greater international alignment, this can create a damaging race to the bottom: national regulators hesitate to price carbon near its social cost because they fear losing competitiveness, while climate damages continue to be passed on to society and future generations. If the objective is to maximize emission reductions per dollar spent, policymakers can sequence mitigation efforts as follows: negative-cost and low-cost measures implemented by the private sector; moderate-cost solutions such as renewables, forest protection, and coal phase-out initiatives through consistent regulation; and higher-cost technologies where alternatives are limited, particularly in hard-to-abate sectors. For development institutions and policymakers seeking cost-effective climate action, this comparison underscores the value of prioritizing low-cost, high-impact mitigation measures while also supporting higher-cost solutions where they are needed for hard-to-abate sectors to advance emission reduction technology and application. The economics suggest that significant emissions reductions remain achievable at moderate cost, provided that policy incentives, financing mechanisms, and implementation capacity are aligned. Resources A. Bilal and D. Känzig. 2024, revised 2026. The Macroeconomic Impact of Climate Change: Global vs. Local Temperature. National Bureau of Economic Research. Working Paper Series. No. 32450. A. Schultes et al. 2020. Economic Damages from On-Going Climate Change Imply Deeper Near-Term Emission Cuts. Environmental Research Letters. 16. No. 104053. M. Burke, S. M. Hsiang, and E. Miguel. 2015. Global Non-linear Effect of Temperature on Economic Production. Nature, 527, 235–239. K. Rennert et al. 2022. Comprehensive Evidence Implies a Higher Social Cost of CO₂. Nature. R. S. J. Tol. 2023. Social Cost of Carbon Estimates Have Increased Over Time. Nature Climate Change. 13. pp. 532–536. US Environmental Protection Agency. 2023. Report on the Social Cost of Greenhouse Gases: Estimates Incorporating Recent Scientific Advances. Ask the Experts Manfred Kiefer Principal Economist, Private Sector Operations Department, Asian Development Bank Manfred Kiefer is primarily involved in assessing development results of ADB’s investments. Prior to this role, he worked as energy economist and development results specialist at different international financial institutions. He holds an MSc in Economics from Freie Universität Berlin. Follow Manfred Kiefer on Leave your question or comment in the section below: View the discussion thread.