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Coal remains a critical component of the world’s energy supply despite its image as a
polluter. As an enemy of environmentalists, it creates so much pollution. In this case, coal still
has the undeniable advantages of being widely available and easy to ship and burn. The biggest
attraction is low cost, however. By many estimates, burning coal still costs about one-third
as much as using renewable energy like wind or solar power. As a result, global demand for coal
is expected to reach 8.9 billion metric tons by 2016. In addition to strong demand for thermal
coal, which is burned in power plants, use of metallurgical coal or coking coal is also expected
to double. For now, coal seems to be avoiding a serious potential impediment to its use:
international treaties restricting greenhouse gas emissions. So far, such agreements to prevent
climate change have been ineffective. In the long term, coal’s future depends on China and
India, which rely heavily on coal for their electric power, and its prospects look bright mainly
because it is cheaper than its competitors.
【題組】44. In the passage, the word “impediment” is closest in meaning to __________.
(A) advantage (B) benefit (C) convenience (D) obstacle
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