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==Key Stage 4==
===Meaning===
'''Greenhouse gases''' are [[gas]]es which are more [[transparent]] to [[Visible Light]] than to [[Infrared LightInfra-red]].
===About Greenhouse Gases===
: '''Greenhouse gases''' lead to the [[Greenhouse Effect|greenhouse effect]].
: If the [[percentage]] of '''greenhouse gases''' in the [[atmosphere]] increases this could cause the [[Mean Average|average]] [[temperature]] of the [[Earth]]'s surface to increase, a process called [[Global Warming]].
: The most common '''greenhouse gases''' are [[Carbon Dioxide]], [[Methane]] and [[Water Vapour]] which all scatter or reflect [[Infrared Light]] back to the surface of the [[Earth]] and prevent it from escaping into [[space]].