There were two periods of over a million years each when the entire planet was covered in ice. They call it "snowball Earth". I think that pretty much throws the evolution theory out the window. Most of Earth's history, it's CO2 levels were in the thousands of ppm. Life didn't go extinct and we didn't cause it. We're not going to kill the planet but we can certainly cause most species to go extinct if we use up all the surface area.