# Blocking of infrared radiation from the sun by $\rm CO_2$ [duplicate]

Why is the infrared heat from the sun not prevented from entering the earth's atmosphere by $\rm CO_2$ to the same extent that it is prevented from leaving the Earth's atmosphere?

## marked as duplicate by sammy gerbil, user191954, Kyle Kanos, Jon Custer, JMacSep 20 '18 at 19:44

The radiation from sun is shorter wavelength than the radiation from earth. $\rm CO_2$ absorbs radiation mostly at wavelengths that the earth radiates. See this illustration of a publication.
So atmosphere acts as a big scatterer and atoms and molecules that absorb infrared like $CO_2$ scatter more and infinite absorbing and re-emitting traps the energy