Global warming begins with the greenhouse effect, the phenomenon is caused by the interaction between the Earth's atmosphere and radiation from the sun to.
Solar radiation passes through the atmosphere and is absorbed in part on ground. However, part of the radiation to be reflected back out into space.
The gases in Earth's atmosphere absorb radiation reflector part it; hence, atmospheric warming.
This warming of the atmosphere is called the "greenhouse effect" because it is similar to the process in a greenhouse to keep warm in winter: Solar radiation is the glass of greenhouse retained, heated greenhouse and kept warm for plants in greenhouses during the winter.
These gases are present in the atmosphere is the main cause of the greenhouse effect are called "greenhouse gases" and including water vapor, carbon dioxide (CO2), methane and nitrous oxide. Greenhouse gases are not always the same: for example, methane has the ability to capture heat about 21 times higher than carbon dioxide, according to the EPA.
However, CO2 is often cited as the main cause of global warming due to human activity - mainly the burning of fossil fuels like coal and oil - as the liberation of a large amount of CO2 into the atmosphere ever since the industrial Revolution in the late 18th century.
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