Radiation is filtered through our atmosphere which makes it suitable for living. 51% of the radiation makes it’s way to the Earth’s surface, the rest is absorbed or reflected. The greenhouse gases most importantly the carbon dioxide molecule can absorb infrared radiation and the molecule starts to vibrate, after a certain amount of time it the vibrating molecule will emit the radiation again, which will likely be absorbed by yet another greenhouse gas molecule. This process, absorption-emission-absorption, effectively keeps the heat near the surface, isolating this from space. If the amount of greenhouse gases rise more and more heat will be “trapped” on the surface of the Earth.
The above answer by seppe is ok. I support it.
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