This booklet, based on the National Research Council report, "Climate Stabilization Targets: Emissions, Concentrations, and Impacts Over Decades to Millennia (2011)", outlines the scientific information that makes it clear that emission reductions today matter in determining impacts that will be experienced over the next few decades and into the coming centuries and millennia. The booklet explains how policy choices can be informed by recent advances in climate science that show the relationships among increasing carbon dioxide, global warming, related physical changes, and resulting impacts.
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