 its climate and Earth's temperatures and not. CO2 is a very small part, and human-emitted CO2 is much, much smaller. Everyday nature puts 20 times as much carbon dioxide into the atmosphere as all of our industries. And this natural CO2 comes out of the oceans, it comes out when plants die, it comes out of volcanoes and other things. They also absorb about the same amount, the oceans and the biosphere.