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— James Hansen"...99 percent confident that the world really was getting warmer and that there was a high degree of probability that it was due to human-made greenhouse gases."
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...the contribution of greenhouse gases to the Vostok temperature changes can be...between a lower estimate of 40% and a higher estimate of 65%.
— Claude Lorius
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Warming of the climate system is unequivocal...most of the global average warming over the past 50 years is very likely due to anthropogenic greenhouse gases increases.
— Rajendra K. Pachauri
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