The cause of the last dramatic pulse of warming so far has been the greenhouse effect.
The process of greenhouse effect occurs when solar radiation hits the earth's atmosphere. The heat radiation reflected by the earth will be blocked so that the heat is trapped in the earth. The process of trapping heat, then causes the earth's temperature to increase.
The greenhouse effect is caused by the increasing concentration of carbon dioxide gas (CO₂) and other gases in the atmosphere. The increasing concentration of CO₂ gas is due to the large use of fuel oil, coal, and other organic fuels which exceed the ability of plants and the sea to absorb them.
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