The gases in Earth’s atmosphere that allow sunlight to pass through, but trap it inside are known as greenhouse gases because they act much like the glass roof does in a greenhouse. In an actual greenhouse, this process is beneficial for the plants inside because they still get the sunlight they need without being exposed to possibly harmful weather. In the Earth’s case, however, because the sunlight allowed through the atmosphere cannot escape back out, these gases are a main factor in global warming.
Greenhouse warming = ok. Earth warming = not ok.
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