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Annual greenhouse gas emissions in the U.S. are projected to rise from 7.2 gigatons CO2e in 2005 to 9.7 gigatons in 2030 – an increase of 35 percent. However, there is significant potential for reducing U.S. emissions. These abatement opportunities include improving energy efficiency in buildings and appliances, increasing fuel efficiency, and reducing the carbon intensity of electric power production. This report analyzes the costs and benefits of various options in an effort to support policy design and inform strategy on the issue of climate change.