The Earth’s surface, warmed by the Sun, radiates heat into the atmosphere. Some heat is absorbed by greenhouse gases like carbon dioxide and then radiated to space (A). Some heat makes its way to space directly (B). Some heat is absorbed by greenhouse gases and then radiated back towards the Earth’s surface (C). With more carbon dioxide in the atmosphere later this Century, more heat will be stopped by greenhouse gases, warming the planet.
Lisa Gardiner / Windows to the Universe