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Did you know that computer models prediciting the increase in Earth's surface temperature over the next 100 years vary by as much as 400%. 400%? That sounds more like a broad guess than any real scientific evidence.
When James E. Hansen announced in the summer of 1988 that global warming was here, he predicted temperatures would increase .35 degrees celsius over the next ten years. The actual incrase was .11 degrees. He overestimated by 300 percent.
10 years after making his predictions, at the Natioanl Academy of Sciences, October 1998 Hansen went on to say "The forcings that drive long0term climate change are not known with an accuracy sufficient to define future climate change".
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