This report reviews a draft of the U.S. Climate Change Science Program Synthesis and Assessment Product 3.2: "Climate Projections Based on Emissions Scenarios for long-lived radiatively active trace gases and future climate impacts of short-lived radiatively acitve gases and aerosols." This is the fourth report in a series of six that the National Research Council was asked to review. The review finds that this product provides initial information regarding the influence of certain trace gases and aerosols on future climate and has shown that these short lived types are significant in forcing climate. However, the review finds that the current draft needs revision to make the document easier to read for experts and the general public alike. The document also needs to distinguish between and elaborate on the models used in the draft. More...
