Emerging Alternative Fuels
Several emerging alternative fuels are under development or already developed and may be available in the United States. These fuels may increase energy security, reduce emissions, improve vehicle performance, and stimulate the U.S. economy.
Additional fuels, such as ammonia, may also meet the criteria for alternative fuels when used in limited quantities. More research is needed to characterize the impacts of these fuels, such as necessary vehicle modifications, required fueling infrastructure, human health impacts, greenhouse gas emissions, and tailpipe emissions.
Also see information about renewable natural gas, a unique way to produce natural gas for transportation.