In testimony on global warming before the U.S. Senate Environment and Public Works Committee January 16, Dr. Judith Curry, Chair of the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology and a long-time contributing author of the UN Intergovernmental Panel on Climate Change (IPCC), challenged President Barack Obama’s Climate Action Plan. Her oral remarks are below. Her full oral testimony is online here, and her much more extensive written testimony is online here.—ECB
… The premise of the President’s Climate Action Plan is that there is an overwhelming judgment of science that anthropogenic global warming is already producing devastating impacts. [In her written testimony Dr. Curry inserted this quote from Obama’s Second Inaugural Address:
Some may still deny the overwhelming judgment of science, but none can avoid the devastating impact of raging fires and crippling drought and more powerful storms.
She then stated, “This premise is not strongly supported by the scientific evidence:
- the science of climate change is not settled, and evidence reported by the IPCC AR5 weakens the case for human factors dominating climate change in the 20th and early 21st centuries
- with the 15+ year hiatus in global warming, there is growing appreciation for the importance of natural climate variability
- the IPCC AR5 and SREX find little evidence that supports an increase in most extreme weather events that can be attributed to humans, and weather extremes in the U.S. were generally worse in the 1930’s and 1950’s than in recent decades.”—ECB]
Anthropogenic greenhouse warming is a theory whose basic mechanism is well understood, but whose magnitude is highly uncertain. Multiple lines of evidence presented in the recent IPCC 5thassessment report suggest that the case for anthropogenic warming is now weaker than in 2007, when the 4th assessment report was published.
(For the rest of the report, click the link.)