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  3. We have the technology and ingenuity to reduce the threat of global warming today. Solutions that are already available will sti

We have the technology and ingenuity to reduce the threat of global warming today. Solutions that are already available will sti

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问题     We have the technology and ingenuity to reduce the threat of global warming today. Solutions that are already available will stimulate the American economy by creating jobs, saving consumers’ money, and protecting our national security. By investing in renewable energy and energy efficiency, and increasing the efficiency of the cars we drive, we can take essential steps toward reducing our dependence on oil and other fossil fuels that cause global warming.
    Using energy more efficiently and moving to renewable energy(wind, solar, geothermal, and bio-energy)would significantly reduce our emissions of heat-trapping gases. The United States currently produces 70 percent of its electricity from fossil fuels such as coal, natural gas, oil, but only two percent from renewable sources. Since the burning of fossil fuels releases large amounts of carbon dioxide—the leading cause of global warming—but renewable energy does not, increasing the share of our electricity generated from renewable resources is one of the most effective ways to reduce global warming emissions. Cars and trucks are another significant source(25 percent)ofU. S. carbon dioxide emissions. A serious effort to address global warming must therefore reduce emissions from cars and trucks. Many technologies already existing can do this, while also creating new jobs in the U.S. automotive sector and other industries throughout the country. In addition, American consumers would save billions of dollars on gasoline and reduce the dependence on foreign oil.
In the U.S. what vehicles produce 25% of its carbon dioxide emissions?
选项 A、Cars and trains.
B、Motorcars and buses.
C、Cars and trucks.
D、Motorbikes and lorries.
答案C
解析
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