When suns radiation hits something with it change its wavelength while reflecting
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1.About 70 to 75% of the solar radiation passes through the atmosphere and reaches the Earth
2.This solar radiation is absorbed on the Earth surface, which warms up the Earth surface.
3.When a body is warmer than its environment, it emits infrared radiation. The is also true for the warmed up surface of the Earth: The surface of the Earth emits infrared radiation.
Because infrared radiation has a different wavelength than solar radiation, its transmission behaviour through the atmosphere is different: 15-30% will be transmitted and 70 to 85% will be reflected back to the Earth. This leads to a further increase of temperature on Earth.
You could summarize this in saying the atmosphere does transmit 70 to 75% of solar radiation but only 15 to 30% of heat radiation.
This effect has always been there, it is not new at all. When the concentration of so-called greenhouse gases (carbon dioxide, Methane, NOx, etc.) is increased, the percentage of infrared radiation which is being transmitted through the atmosphere is reduced or in other words: When the concentration of greenhouse gases in the atmosphere is increased, more infrared radiation is reflected back to the Earth by the atmosphere. This leads to an increased temperature of the surface of the Earth. This increased effect due to higher concentration of greenhouse gases is normally called global warming or climate change.
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