Today almost 70% of the electrical power we use comes from p

Today almost 70% of the electrical power we use comes from power plants that use fossil fuels (矿物燃料) to make electricity.Fossil fuels,such as oil,coal,and natural gas,are burned to make electricity.Burning fossil fuels releases pollution and carbon dioxide gas (CO2) into the air.The more fossil fuels we burn,the warmer the air around Earth gets.So building fossil fuel plans is not always the best answer.
Actually,there are other ways to make electricity without burning fossil fuels.People have been using the power of wind for centuries.Wind power won’t solve all our energy problems,but it can help meet some of the demands in certain places.Since the late 1800s,scientists have been
working to turn the sun’s energy into electricity by using solar cells (太阳能电池).The problem is,solar cells are very expensive.Another way to make electricity is to use nuclear energy.It has been used for more than 50 years.Today about 10 percent of all the electricity used in the U.S.A.comes from this source.
Although nuclear power doesn’t pollute the air as the burning of fossil fuels does,there is a major drawback .The waste products from nuclear power plants are dangerous and must be stored in safe places.Many people are concerned about the safety of nuclear power
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现在,我们所使用的70%的电能是由使用矿物燃料发电的发电厂提供的.通过燃烧像石油,煤和天然气的矿物燃料来发电.燃烧矿物燃料会释放污染物和二氧化碳气体到空气中.燃烧越多的矿物燃料,地球的空气的温度就越高.所以建造矿物燃料发电厂不都是最好的办法.
事实上,还有很多不通过燃烧矿物燃料来发电的方法.人们已经使用风能几百年了.风能不能解决所有的能源问题,但是它可以在特定的地方满足我们的一些需求.自19世纪以来,科学家一直努力通过太阳能电池来将太阳能转化为电能.但问题是太阳能电池很昂贵.另外的一种方法是用核能来发电.核能已经用来发电超过50年了.现在,大概美国使用的10%的电是使用核能发电的.
尽管核能不会像燃烧矿物燃料一样污染空气.但是它也有一个大的缺点.核能发电站的废弃物是很危险的,并且要存储在安全的地方.很多人为核能的安全问题而担忧