Historical climate datasets come from Chris Daly (Oregon State University) using PRISM (www.prism.oregonstate.org). Projections of future climate were created using a climatology created with historical PRISM data and anomalies from 3 general circulation models and 3 emission scenarios.
Emission scenarios cover a wide range of the main demographic, economic, and technological driving forces of green house gases (GHG) and sulphur emissions.The A2 scenario corresponds to 1250 ppm CO2 eq, 15.1 billion people on the planet, 53% of the primary energy source being coal, resulting in a global warming of 2.0-5.4 deg. C by 2100. The A1B scenario corresponds to 800 ppm CO2 eq, 7.1 billion people on the planet, 4% of the primary energy source being coal, resulting in a global warming of 1.7-4.4 deg. C by 2100. The B2 scenario corresponds to 600 ppm CO2 eq, 7 billion people on the planet, 8% of the primary energy source being coal, resulting in a global warming of 1.1-2.9 deg. C by 2100.
The climate models used to calculate anomalies are from the Hadley Center for Climate Prediction in the UK (Hadley), the Commonwealth Scientific and Industrial Research Organization in Australia (CSIRO Mark 3.0), and Japan (MIROC or Model for Interdisciplinary Research on Climate medium-resolution version 3.2).