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PCJohn: Time is generally not a good source on anything, but I had read the article nontheless. This National Academies summary is a better starting point: http://dels.nas.edu/basc/Climate-HIGH.pdf
All those articles establish is that the earth is warming, and that greenhouse gases contribute to global warming (hard to dispute either). But, there is no evidence that this warming is not due primarily to natural climactic change, and further, that there is any way to prevent it.
My personal view is that it is worth the effort to cut down on emissions, find alternate (non-fossil) fuel sources, and stop polluting the air -- if that stops global warming great, but there are other good reasons for making those changes.