Solar radiation is considered the main source of heat on the Earth. It can be noticed through the sunshine if it is not blocked by the clouds. However, this radiation causes an increase in the air temperature. It has been noticed that the amount of radiation received by objects on the Earth varies depending on the distance between the Earth and the Sun.
Recently, the Earth has experienced large variations in solar radiations so that scientists consider this matter as a main factor in the occurrence of the most common problem of global warming. Some researchers suggest that the sun contributed about 40 -50% of the global surface temperature warming during 1900-2000.
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