"Once you know global warming is present, why would you have to do it over and over again?" said Trenberth, adding later that "we're breaking [heat] records in a way that is clearly exceptional—we're not breaking records the same way on the cold side."
Other scientists are not convinced that Hansen's study adds much to ongoing study of climate change's influence on weather extremes.
Martin Hoerling, a scientist at NOAA's Earth System Research Laboratory who has published several papers examining the role climate change played in individual weather events, like the 2010 Russian heat wave, said Hansen's analysis "does not present new science."
He criticized Hansen for including a brief discussion of policy responses to combat warming.
"This is obviously not meant to be a scientific paper, but it much closer to an extended op-ed piece," Hoerling said in an email. "The paper argues for a policy response, and supports the policy argument within an assessment of the recent global temperature record, and additional surmised implications of temperature on climate."
Reprinted from Climatewire with permission from Environment & Energy Publishing, LLC. www.eenews.net, 202-628-6500