| Description: |
The Earth's climate is now clearly out of balance and is warming. Many components of the climate system-including the
temperatures of the atmosphere, land and ocean, the extent of sea ice and mountain glaciers, the sea level, the distribution
of precipitation, and the length of seasons-are now changing at rates and in patterns that are not natural and are best
explained by the increased atmospheric abundances of greenhouse gases and aerosols generated by human activity during
the 20th century. [Source: American Geophysical Union]
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