In this video I will explain how carbon dioxide, CO2, keep our Earth warm. Earth's atmosphere absorbs the Sun's energy spectrum at particular frequencies and molecules colliding with each other broadening that spectrum. Carbon dioxide has 10 vibrational modes that is effective, at some range, in absorbing energy. Out of the 10 there are 3 that is effective; and out of those 3, there is one that make all the difference in the world.