text: The Sun that nurtures us will eventually incinerate the Earth. According to an article in PNAS, Earth's entire biota are threatened by the eventual loss of atmospheric carbon dioxide. You see CO 2 is plant food and without it there are no plants. Without plants there are no animals, and that includes human beings (assuming we manage to survive until then). The eventual death of the planetary biosphere due to lack of carbon dioxide tells us some things about the current CO 2 induced global warming hysteria. As S. Franck, C. Bounama, and W. von Bloh put it in Causes and timing of future biosphere extinction in Biogeosciences Discussions :