New 2013 UN IPCC report says no strong science exists to connect humans to hurricanes, floods, tornadoes, or drought.

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"The conclusions with respect to hurricanes and drought both represent a walking back from more aggressive conclusions reported in 2007."

9/28/13, “Five Points on the IPCC Report (Wonky, Long),” Roger Pielke, Jr.

“5. There is not a strong scientific basis for claiming a discernible effect of human-caused climate change on hurricanes, floods, tornadoes or drought.

This is a familiar conclusion to readers of this blog, so I won’t belabor it (more to come soon on this). Here is what the IPCC SPM [Summary for Policy Makers] says about each:

• Hurricanes (tropical cyclones):  ”Low confidence” in both a “human contribution to observed changes” and “likelihood of future changes”
• Floods: No comments in the SPM
• Tornadoes: No comments in the SPM
• Drought:  “Low confidence” in both a “human contribution to observed changes” and “likelihood of future changes”

The conclusions with respect to hurricanes and drought both represent a walking back from more aggressive conclusions reported in 2007, and should not be a surprise to readers here, as that is what the literature says.”…via Tom Nelson





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