Fortunately the United States government recognizes the seriousness of greenhouse emissions and the impact on global warming and is making progress in reducing gas emissions from vehicles. Travel growth has risen faster than the improvement improvements in energy efficiency but this doesn’t stop the United States government from promoting energy efficiency, use of renewable energy and trip reduction thru public and private programs. There has been significant development of fuel-efficient vehicles, researching options for cleaner fuel, programs implemented to reduce travel and even incentives for those people who modify or buy vehicle

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