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Thanks in no small part to A1 Gore and his film producers, the American public is waking up to the seriousness of global warming. What is not so widely appreciated is that unless the US government acts urgently and decisively, this problem could very quickly get very much worse.
For reasons both economic and political coal is poised to be the fuel of choice in the coming decades as the US weans itself off foreign oil. Coal combustion generates half the US's electricity and releases about 1.5 billion tons of carbon dioxide a year. If present trends continue, these figures will more than double by 2050, much to the detriment of the world's climate. Without an alternative fuel, the only solution is to capture and store carbon dioxide from burning coal.
Overcoming the engineering obstacles in the way of large-scale sequestration of carbon dioxide will be hard enough, but the bigger challenge is one of political will. US companies as yet have no incentive to capture carbon emissions. While moves at state and congressional levels are pushing in the right direction, the ambiguity in the administration's policy is counterproductive.
It is time for the US government to put a price on carbon emissions so utilities that invest in technologies to reduce carbon emissions will see their efforts rewarded. Such a move would not only reduce the risks associated with global warming, but also go a long way to restoring America's green credentials.
48．According to the author, what adds to the seriousness of global warming?
A．The American public was ignorant of the problem.
B．The American government is doing nothing to deal with the problem.
C．The US will choose coal as the major fuel which will have large carbon emissions.
D．There is no alternative fuel other than foreign oil which has large carbon emissions.
49．Which of the following is true about the obstacles for effectively capturing carbon emissions?
A．The existing technology is only able to deal with large-scale carbon emissions.
B．The companies are not highly motivated in adopting new technologies.
C．The government policy for using coal and oil is counterproductive.
D．The companies feel reluctant to be involved in political issues.
50．What does the author suggest as a solution to the problem?
A．The government should charge carbon emissions so as to encourage companies to adopt new technology.
B．The government should reward utilities that invest in technologies to reduce carbon emission.
C．The government should make long-time efforts to encourage people to plant more trees.
D．The government should pay for large-scale carbon emissions.
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