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CAPTION: This graph (using the mid-range values of estimates) shows seven "wedges" representing (from the top down) the U.S. carbon displacement potentials by 2030 (the target year for this study) for energy efficiency, wind power, biofuels, biomass, photovoltaics, concentrating solar power, and geothermal power. Also shown are the paths needed to achieve 60% and 80% reductions below today’s emissions by mid-century—the target range given by many scientists. Energy efficiency measures alone have the potential to keep our nation’s carbon emissions roughly constant over the next 24 years as our economy grows. The various renewable technologies have the potential to make the deep cuts below today’s emissions that scientists believe are needed.