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Re: Global warming - beyond debate?
"Well I think he's talking about what nomadking said, the very fact that historically it has changed without human intervention."
Well yes - but so what? All climate scientists know that there are natural events that affect the climate (the 11 year sun spot cycle and major volcanic eruptions are two examples). What climate scientists are doing is subtracting out the known causes of variation to see what is left. When that is done you get an underlying warming trend, which correlates strongly with an increase in greenhouse gases in the atmosphere. As far as I am aware there is no other plausible explanation for the currently observed global warming trend.
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