Tuesday, May 03, 2005

Global Warming Just Hot Air? Part 2

Courtesy of The Friends of Science
Myth 2: The “hockey stick” graph proves that the earth has experienced a steady, very gradual temperature increase for 1000 years, then recently began a sudden increase.

Fact: Significant changes in climate have continually occurred throughout geologic time. For instance, the Medieval Warm Period, from around 1000 to 1200 AD (when the Vikings farmed on Greenland) was followed by a period known as the Little Ice Age. Since the end of the 17th Century the "average" global temperature has been rising at a rate of 0.6 to 0.8 degrees Celsius per 100 years; although from 1940 – 1970 temperatures actually dropped, leading to a Global Cooling scare. The hockey stick not only ignores historical fact, but is also scientifically flawed.
How much carbon does the average tree pull out of the atmosphere in a year? If I plant a few trees on my lot, does that mean I have met my one tonne challenge? If we plant enough trees, do we get carbon credits for that?