Great book about the subject.
"State of Fear", by Michael Crichton
( also author of "Jurassic Park", "Andromeda Strain, "Congo", etc. )
his web site >>>
http://www.crichton-official.com/
http://www.tcsdaily.com/article.aspx?id=011905B
..... "Among Crichton's many logical conclusions three stand out:
"We know astonishingly little about every aspect of the environment, from its past history, to its present state, to how to conserve and protect it. In every debate, all sides overstate the extent of existing knowledge and its degree of certainty.
Nobody knows how much warming will occur in the next century. The computer models vary by 400 percent, de facto proof that nobody knows; and
Before making expensive policy decisions on the basis of climate models, I think it is reasonable to require that those models predict future temperatures accurately for a period of ten years. Twenty would be better."......