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It's not! There is a natural greenhouse effect, which keeps the earth warm enough for life, but this is not what we mean by global warming.

As long as greenhouse gas concentrations remain at their natural, long term levels, uninfluenced by human activity, the warming of the earth is natural and has in fact helped maintain the world's temperature at a comfortable level suitable for human existence. The increase in global temperatures above this level is accepted by most climate research scientists as principally the result of human activity.

Greenhouse gases are gases that build up in the Earth's atmosphere and absorb infrared radiation. This causes a warming effect in the lower atmosphere and on the surface of the planet. The main naturally occurring greenhouse gases are: water vapour (H2O), carbon dioxide (CO2), methane (CH4) and ozone (O3). Water vapour does not refer to clouds that are lower in the atmosphere, as clouds are liquid water and reflect solar radiation, which would have a cooling effect.

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