Notwithstanding important recent progress in developing renewablefuel sources, low fossil fuel prices could discourage further innovation in, and adoption of, cleaner energy technologies.
A number of bases inside the US have begun to tap into renewablefuel sources including wind and solar energy.
美国国内的一些军事基地已经开始利用包括风能和太阳能在内的一些可再生能源。
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In Montana, Hawaii and Minnesota all petrol must contain 10% ethanol, while Washington state requires petrol and diesel to contain 2% renewablefuel by volume.