事实上，美国是全世界最大的生物乙醇生产国，加之页岩气的生产 — — 已经在降低二氧化碳排放及创造当地就业机会的同时，减少了至少25%的国外石油进口。
Indeed, the US is the world’s largest producer of bioethanol, which – along with the production of shale gas – has helped reduce foreign oil imports by at least 25%, while lowering carbon dioxide emissions and creating local jobs.