Greenhouse gases actually occur in the atmosphere naturally. They’re gases that keep the earth at a stable temperature by trapping some of the infrared radiation from the sun in the atmosphere and reflecting the rest away. However, the burning of fossil fuels has released much more of these gases into the atmosphere, which means more heat is trapped in the earth and less is reflected back into space. That’s why greenhouse gases are contributing to global warming, and seem to have such a horrible stigma attached to them. Without the presence of some greenhouse effect, however, the earth would be too cold to sustain the wide array of life it is now home to.
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