It always appeared to me that when the oil industry added something to the global warming discussion, it was usually intended to delay any significant actions by saying there's still some doubt about the science. Other industries generally participated by supplying data and results of studies that helped quantify what's happening, or supported less onerous actions than those that were favored by more activist groups. The intent was to make sure that any regulations were based on good data and not so severe as to do more harm than good. I generalize here...there's some grey between the black and white. Incidentally, the discussions within the technical groups were much more civil than some statements made in the media.
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