The only thing that is open to debate is the magnitude of the impact. To say that the increase in CO2 has had no impact is simply not correct. The physics are well understood. Think of it this way: there are longer term climatic trends (some are caused by changes in the earth's orbit). Increases in CO2 will cause a perturbations on those trends. The magnitude is what is open for debate. I personally don't buy into the doomsday scenarios but the increases in CO2 do have an impact.
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Originally Posted by shumbapie
I agree with you (BTW, nice pedigree). My point is that some people assume that man caused global warming is a fact (the term "settled science" is used a lot). Man may or may not have an impact. I'm just saying it has not been proven, therefore, it is still a theory "that it is caused by man".
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