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Why is it happening?

The greenhouse effect is a naturally occurring phenomenon, however the effect has been intensified by human activity and the emission of gases into the atmosphere.

Diagram showing the greenhouse effect

Heat from the sun is usually reflected back into space by planets such as Earth, some of the heat is trapped by the surrounding blanket of gases and is radiated back to warm the Earth. Whilst we would not exist if this did not happen, the problem is the amount of gases in the atmosphere is increasing, and less heat can escape therefore more heat is being trapped in the atmosphere – increasing the temperature of the Earth.

The main human influence on global climate is the emission of so called greenhouse gases such as carbon dioxide (CO2), methane and nitrous oxide

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