How quantum mechanics explains global warming (5 minutes):
As the sun emits the full spectrum of electromagnetic energy, the Earth absorbs both longer waved infrared light (IR) and shorter waved visible light. The total of this absorbed energy causes thermal heating that is gradually re-emitted in the form of infrared energy. Much of this is reabsorbed by the larger molecules in the atmosphere such as carbon dioxide and water vapor, but not the smaller molecules such as nitrogen and oxygen. This creates a positive feedback loop between the atmosphere and the Earth’s surface and causes temperatures to rise. Thus, more heat is retained than escapes back into space.
Note: Any increase of larger molecules in the atmosphere raises its thermal level and is a function of both classic physics and quantum mechanics.