Climate change mitigation is any action that reduces the greenhouse gases humans release into the atmosphere or pulls existing greenhouse gases back out of it. The Intergovernmental Panel on Climate Change defines it as “a human intervention to reduce emissions or enhance the sinks of greenhouse gases.” In practical terms, it covers everything from replacing coal plants with solar farms to capturing methane on dairy operations to insulating buildings. The goal is to slow warming enough that the planet remains livable.
Mitigation vs. Adaptation
These two terms come up together constantly, so it helps to draw a clean line between them. Mitigation targets the root cause of climate change: the buildup of heat-trapping gases in the atmosphere. Adaptation targets the consequences, helping people and ecosystems cope with the warming that has already happened or is locked in. Building a wind farm is mitigation. Raising a seawall to handle rising tides is adaptation. Both are necessary because even aggressive mitigation cannot undo the warming already set in motion. Sea levels, for example, will likely continue rising for centuries after global temperatures stabilize.
The Global Target
The Paris Agreement, signed by nearly every country, sets the benchmark. To limit warming to 1.5°C above pre-industrial levels, global greenhouse gas emissions must peak before 2025 and fall 43% by 2030. That is an enormous reduction on a very short timeline, and it shapes every mitigation strategy governments and industries pursue today.
Cleaning Up Electricity
Electricity generation is one of the largest sources of global emissions, which makes it the sector where mitigation efforts have moved fastest. The core strategy is straightforward: replace fossil fuel power plants with zero-emission sources like solar, wind, nuclear, and hydropower. Policy tools such as renewable energy mandates, tax incentives, and energy taxes on fossil fuels have driven this shift across Europe, North America, and parts of Asia.
The investment numbers reflect the momentum. Globally, roughly twice as much money now flows into clean energy as into fossil fuels. In power generation specifically, the ratio of clean to unabated fossil fuel investment was about 2:1 in 2015. By 2024, that ratio reached 10:1, according to the International Energy Agency. That doesn’t mean the job is done, but the direction of capital has shifted decisively.
Buildings and Heat Pumps
Heating and cooling buildings accounts for a significant share of energy use, particularly in colder climates. One of the most effective mitigation steps at the household level is replacing gas or oil furnaces with electric heat pumps, which move heat rather than burning fuel to create it. A study of German residential buildings found that heat pump retrofits reduced average annual CO2 emissions by roughly 19% to 39%, depending on the year’s weather and grid conditions. Pairing a heat pump with rooftop solar panels and a battery pushed reductions to between 31% and 44%, even in a Central European climate where winter sunlight is limited.
Insulation matters too. Better-sealed walls, windows, and roofs reduce the energy a building needs in the first place, making the switch to electric heating more affordable and effective. Cities that combine building efficiency standards with electrification incentives can cut a large slice of their emissions without waiting for new power plants.
Industry and Carbon Capture
Some industries are particularly difficult to decarbonize. Making steel requires extreme heat. Producing cement releases CO2 from the chemical reaction itself, not just from burning fuel. Heavy shipping and aviation rely on energy-dense liquid fuels that batteries can’t easily replace. These are often called “hard to abate” sectors.
Carbon capture and storage (CCS) is one technology aimed at these stubborn sources. It traps CO2 at the point of emission, compresses it, and stores it underground. The IEA projects that by 2030, capture capacity from industrial facilities like cement and steel plants could reach about 50 million tonnes of CO2 per year. Another roughly 65 million tonnes per year could come from direct air capture, machines that pull CO2 straight from the atmosphere. These numbers are growing but still represent a small fraction of total global emissions, which topped 50 billion tonnes in recent years.
Agriculture and Methane
Agriculture produces a large share of global methane emissions, a greenhouse gas that traps far more heat per molecule than CO2 over a 20-year window. Livestock manure management is a major source, and the way manure is handled determines how much methane escapes.
Storing manure in large, wet, oxygen-free lagoons creates ideal conditions for methane production. Mitigation strategies aim to break that cycle in several ways:
- Anaerobic digesters capture the methane before it reaches the atmosphere and burn it for energy or destroy it.
- Pasture-based management avoids concentrated storage entirely, letting manure decompose in open, oxygen-rich conditions that produce far less methane.
- Composting keeps manure in aerobic (oxygen-present) conditions, which also cuts methane.
- Solid separation removes solids from liquid manure before storage, reducing the organic material available to produce methane in lagoons.
- Shorter storage times give manure less time to break down anaerobically.
No single fix eliminates agricultural methane, but combining these practices across large operations can make a meaningful dent.
Carbon Pricing as a Policy Tool
Governments use two main mechanisms to put a price on emissions and incentivize mitigation. A carbon tax sets a fixed price per tonne of CO2 emitted, typically applied to the carbon content of fossil fuels. Companies know exactly what they’ll pay, but the total amount of emissions reduction depends on how the market responds. An emissions trading system (sometimes called cap and trade) works the other way: the government sets a cap on total emissions and issues a limited number of allowances that companies can buy and sell. The emissions ceiling is fixed, but the price per tonne fluctuates with supply and demand.
Carbon taxes are generally simpler to administer and fall under finance ministries. Emissions trading systems require more infrastructure to track and verify allowances, and they typically sit under environment ministries. Both approaches aim to make polluting more expensive, which pushes businesses toward cleaner alternatives. Dozens of countries and regions now use one or both.
How It All Fits Together
No single technology or policy can close the gap between current emissions and the 43% reduction target for 2030. Mitigation works as a portfolio: cleaner electricity, electrified buildings and vehicles, industrial carbon capture, agricultural reform, forest protection and restoration, and economic policies that make carbon-intensive choices more expensive. Each piece chips away at a different source of emissions. The challenge is deploying all of them fast enough, in enough places, to bend the global emissions curve before the carbon budget for 1.5°C runs out.