The Greenhouse effect

The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface, energy is transferred to the surface and the lower atmosphere. This is because the atmospheric gases, virtually transparent to solar radiation, absorb infrared radiated from the Earth. As a result, the temperature there is higher than it would be if direct heating by solar radiation were the only warming mechanism.

The growing presence of greenhouse gases are endangering the Earth

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