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Global Warming
Word count: 711 | Approximate pages: 3
The greenhouse effect, in environmental science, is a popular term for
the effect that certain variable constituents of the Earth's lower atmosphere
have on surface temperatures. It has been known since 1896 that Earth has been
warmed by a blanket of gasses (This is called the “greenhouse effect.”). The
gases--water vapor (H2O), carbon dioxide (CO2), and methane (CH4)--keep ground
temperatures at a global average of about 15 degrees C (60 degrees F). Without
them the average would be below the freezing point of water. The gases have
thi ....
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