"Global warming fails the random natural variation contest"

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The article Global warming fails the random natural variation contest , is about a challenge issued to scientists who insist that human activity is the sole cause of warming. It seems that no one could show that such a claim is true by using the data.

Humans have prospered during the warmer periods, humans need plants and plants are prospering with the added CO2. The added CO2 is too small, relatively speaking, to have a major impact on climate. The math shows that is the CO2 were doubled from 280ppm to 560ppm that would only add about 0.6C if all else remained equal.

If we are doing harm then it is with the construction of huge urban areas that produce islands of heat.