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Prominent Scientist Dr. Botkin, who has studied climate change for 45 years, told the Committee in Q&A: 'I have been concerned about global warming since 1968 and in the 1980s, it looked like the weight of evidence lent towards human induced climate change, to a significant extant, and since then it's moved against it.'
Later in the hearing, Botkin elaborated: 'I was concerned that there was a human induced climate warning and I gave talks and TV interviews that said that, but since the middle of the 1990s, there is evidence that is running against that.
For example the temperature change is not tracking carbon dioxide very well. Then there is the information from the long term antarctic ice core and some from recent paper in the arctic, that suggest that carbon dioxide does not lead temperature change, it may actually lag it significantly or may not lead it at all, and if that is the case that is still an open but important scientific evidence.
So there are several lines of evidence that are suggesting that it (AGW) is a weaker case today, not a stronger case.'
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