Scientists have known for a long time that the "new" rock on the surface of Earth, pushed up by mountains, has soaked up carbon dioxide. Volcanoes erupted, producing carbon dioxide, and the rock would absorb enough that there was not too much carbon dioxide, but enough to ensure the survival of man. In summary, this new rock has kept the Earth in geological cycles making sure there is not too much or too little carbon dioxide in the air.
These studies have shown that the Earth will not get too hot like Venus (it will not have too much carbon dioxide in the air) and it will not get too cold like Mars (it will not have too little carbon dioxide in the atmosphere).
Learn More At: http://www.sciencedaily.com/releases/2014/03/140319143904.htm