The Earth's atmosphere consists essentially of nitrogen (78%) and oxygen (21%). 1% mostly belongs to argon and other substances. These gases are transparent to sunlight passing through them and heat the Earth's surface. Warm earth and oceans in their turn heat the lower part of the atmosphere. Part of this heat re-enters the space. If this is all over, the average temperature on Earth would not exceed -18 ° C instead of the current 15 ° C.
The temperature at the surface of the Earth is the result of an equilibrium established between radiation coming from the sun and the energy
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