The Terrifying Global Warming

Global warming is true and is going on!
Mainstream of scientific community recognize the global warming. It is indeed happening. By the beginning of the 20th century, the average surface temperature of the earth has increased 1.1 F (0.6 C). In the last 40 years, the air temperature has increased 0.5 F (0.2- 0.3 C). Global warming has been going on in the last 400- 600 years, but the fastest in the 20th century.
As a result, the natural environment has been changing. We can see glaciers are

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