Global warming can be defined loosely as Earth's increase of near surface air and water temperature since the mid 20th century. Greenhouse gases, radiative forcing, and atmospheric CO2, as well as aerosols and soot and solar variation are known external forces that effect climate response. There are several views and controversies with global warming which stem through politics, public opinion and scientific knowledge. Many believe that population and humans in general show a direct link to the effect of climate change. While others feel that climate change is a natural effect that has no bearing on human interference.
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