In the efforts to reduce humanity’s emissions of carbon dioxide, three solutions have been offered: hydrogen-powered cars, elect

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问题 In the efforts to reduce humanity’s emissions of carbon dioxide, three solutions have been offered: hydrogen-powered cars, electric cars and biofuels. Biofuels are gasoline substitutes produced from plants like corn or sugar cane. Plants absorb carbon dioxide as they grow, but growing crops for fuel takes up wide strips of land. Hydrogen-powered cars emit no carbon dioxide, but producing hydrogen requires energy, and if that energy comes from coal-fired power plants, then the problem has not been solved. The problem with electric cars is that they have typically been limited to a range of tens of miles as opposed to the hundreds of miles that can be driven on a tank of gas.

选项

答案在努力减少人类排放的二氧化碳的过程中，有三种解决方案可供选择：氢动力燃料汽车、电动汽车和生物燃料。生物燃料是汽油的替代物，可以用玉米或甘蔗之类的植物生产出来。植物在生长过程中吸收二氧化碳，但是种植用来提取燃料的庄稼需要占用大片的土地。氢动力燃料汽车不会排放二氧化碳，但生产氢却需要能源。如果能源是由燃煤电厂提供的，那么问题还是没有得到解决。电动汽车的问题是它只能在数十英里的范围之内运行，与之相对的是装一油箱汽油的车就能开几百英里。

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