增加可再生能源使用对美国能源支出和温室气体排放的影响Impacts on U.S. Energy Expenditures and Greenhouse-Gas Emissions of Increa

过去几年石油价格大幅上涨，人们对能源安全的担忧，以及对全球变暖的日益担忧，极大地增加了人们对在美国发展可再生能源的兴趣。用可再生能源替代化石燃料将减少二氧化碳（CO2）的排放，二氧化碳是全球变暖中最普遍的“温室气体”。通过降低对石油的需求，可再生燃料的替代可以促进国家能源安全。此外，从农村地区增加可再生能源供应可以提高美国农村的收入。

Sharply higher prices for oil over the past several years, concerns about energy security, and growing worries about global warming have greatly increased interest in expanding renewable energy in the United States. Substituting renewable energy for fossil fuels would reduce emissions of carbon dioxide (CO2), the most prevalent “greenhouse gas” (GHG) associated with global warming. By lowering demand for oil, substitution of renewable fuels could contribute to national energy security. In addition, increased renewable-energy supplies from rural areas could enhance rural incomes in the United States.