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Greenhouse gases are mainly produced by carbon dioxide (or CO2), methane and nitrous oxide. These gases come from burning fossil fuels like , cutting down , which absorb CO2, animals and .
The releases energy. This energy then comes toward . Some of that energy reaches us and some of that energy is absorbed by the earth's atmosphere. Energy from earth is then radiated back out to but because greenhouse gases trap some of that energy, it can't . Therefore, the earth warms up. More greenhouse gases equal warmer .