by 
Anonymous
ANSWERS: 4
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No one knows for sure. Thermometers were never as accurate as they are today, which matters when you want measurements within a degree or two yo...
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One half of one degree. Seems like a pretty lame threat, doesn't it?
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1 or 2 degrees I heard, doesn't seem alot but makes the world of difference
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A l00 year timeframe is incredibly short, however - Research shows that global temperatures have in fact risen by .6 degrees Celsius (1 degree Farenheit) over the past 100 years and the National Academy of Sciences indicate that the increase is due in large part to human activity. http://www.ncdc.noaa.gov/paleo/ctl/cliihis100.html temperatures have risen by more than 20°C (36°F) since the height of the Ice Age 25,000 years ago. http://www.pbs.org/wgbh/nova/warnings/stories/nojs.html
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