From: http://www.sciencemag.org/feature/express/expresstwise.shl#1082393

This Week in Science Express

Question of Degrees



The only reconstruction that has been performed on satellite-based data of temperature changes in the middle to upper troposphere during the past 30 years showed minimal temperature change over that interval. Santer et al. present a new tropospheric and stratospheric temperature reconstruction, based on the same data as the earlier version, to show that substantial warming of the troposphere has occurred from 1979 to 2001. They identify a "fingerprint" of combined anthropogenic and natural factors that are consistent with the new analysis showing tropospheric warming but not with the old one, which shows virtually no overall warming. They discuss the implications of observational uncertainty for climate-change detection studies.