Rocky Mountain Institute’s Reinventing Fire analysis shows that such a future is possible, offering market-driven strategies for powering a US economy that is 158% larger in 2050 – without reliance on oil, coal, or nuclear energy. Swift and determined action to make buildings more energy-efficient, design automobiles that require little or no fossil fuels, and increase the share of renewable energy in the electricity supply could ensure that the substantially hotter and less pleasant world of 2050 that the IPCC warns against does not materialize.