As the sun emits the full spectrum of electromagnetic energy, the Earth absorbs both longer waved infrared light and shorter waved visible light.
https://science.nasa.gov/ems/03_behaviors
This absorbed energy causes thermal heating and 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.
https://wattsupwiththat.com/2011/03/29/visualizing-the-greenhouse-effect-molecules-and-photons/
During daytime, the positive feedback loop between the atmosphere and the Earth’s surface causes temperatures to rise. More heat is retained than escapes back into space.
Read more:
https://samslair.blogspot.com/search?q=Greenhouse+Effect&m=1
