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Greenhouse gases are very insulating, so when they float up to the atmosphere, they insulate the world. Sunlight and heat goes in through them, but more goes in than goes out. So gradually all the heat is being built up in the world. They are called greenhouse gases because they have the same effect on the Earth that a greenhouse has on the plants inside: it lets heat in but not out.

This is what is causing global warming.

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15y ago

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