It relies on actual climate data dating back to 1950, including variability in the amount of solar radiation emitted by the sun, historical data on volcanic activity, and changes in the earth's surface. (nola.com)
A new study comparing the composite output of 22 leading global climate models with actual climate data finds that the models do an unsatisfactory job of mimicking climate change in key portions of the atmosphere. (sciencedaily.com)
The authors, Reed Maxwell at Lawrence Livermore National Laboratory, California, and Stefan Kollet of Bonn University, Germany, use actual climate data from 1999 as control conditions for the Great Plains watershed model. (blogs.nature.com)