environmentally friendly renewable energy
环保可再生能源
President Jimmy Carter, in an address to the nation, proposed that by the end of the century, 20% of the electricity used in the U.S. should be derived from the sun. At the time he made the statement, it seemed like an environmentally friendly vision that could be accomplished; however, as we enter the year 2002, solar and wind generated power only supply about 2% of the nation’s demand for electricity. In the past, the barrier that separated wind and solar energy from fossil fuel energy was cost efficiency. Recently, many advances in technology may have broken that cost barrier, and it may no longer be an obstacle for industry and consumers to have cheaper access to renewable energy. Some officials comment that the prices of renewable energy are about 1/8 of what they were 12 years ago, and they expect solar and wind powered energy to be the fastest growing energy source for individual buildings and houses over the next few decades. In fact, in some areas, wind farms are growing in demand because they are cheaper to add than non-renewable fossil fuel energy sources. Some energy analysts are optimistic that by the year 2020, wind and solar energy may supply 10% of the nation’s energy demands. Other renewable energy sources such as hydroelectric dams, which currently generate about 8–10% of the nations electricity, are not expected to grow in demand. Although hydroelectricity is viewed as a clean energy source, it does come at a high price of altering the natural flow of river water, nearby plant and wildlife habitats, and forcing some fish species near extinction. The worksheet includes the URL for the U.S. Department of Energy web site.
仅供参考,有些句式可以套用.愿你写出一篇好的文章.