This would be a great advantage because, as most scientists agree, burning fossil fuels is the main cause of environmental problems such as acid rain and global warming. Many warn that we will face widespread environmental disaster if we do not cut back on our use of these fuels. That is why environmentalists and scientists alike say it is time to look seriously for ways to harness an energy source that is clean, safe and cheap: namely, the sun. The only question is how.
诚如大多数科学家所言，利用好太阳能相当有益，燃烧化石燃料是导致酸雨和全球变暖等环境问题的首要因素。他们警告人类必须减少使用化石燃料，否则将面临全面的环境灾难。 难怪环保人士和科学家都主张要积极设法利用干净、安全而又便宜的能源──太阳能。问题是，怎么利用呢？
