What are CO2 equivalents?

We use_{CO2 equivalents} to collectively express the human impact on the atmosphere and make it tangible and calculable. However,_CO2 is not the only gas that is emitted in large quantities as a result of our activities and influences the climate. Methane, for example, is another gas that is released in excessive quantities as a result of human activity. 1g of methane has about 25 times more impact on the climate than 1g of_CO2. So 1g of methane equals 25g_{of CO2 equivalents}.