Climate change mitigation is when people try to stop the Earth from getting warmer. This happens when people stop doing things that pollute our air, like burning fossil fuels like oil and coal to power cars and factories, and cutting down forests that help keep the air clean and cool. People can also help fix the problem by planting trees and using clean power sources like solar and wind to make electricity. This can help reduce the amount of heat-trapping gases in our air, which will stop the Earth from getting too warm.