Increased levels of CARBON DIOXIDE and METANE in the atmosphere cause the GREEN HOUSE EFFECT.
The greenhouse effect is a natural effect. Without it, the Earth would be much cooler.
GREENHOUSE GASES occur naturally through the release of gases from volcanoes and methane.
Burning FOSSIL FULES and DEFORESTATION are human activities which are resulting int he increase in Greenhouse gases .
Greenhouse gases act like a blanket around the Earth.
Heat from the sun is traped, causing the Earth's tempreture to rise.
Rising tempreture has caused the melting of the polar ice caps, resulting in a rise sea level.
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