A sensible one would raise the price of coal-fired generation enough to make cleaner, plentiful natural gas an economic alternative.

一个明智的做法是提高煤电的价格以使干净的、丰富的天然气成为经济的选择。

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So an alternative is to ask people how much they would pay for a safer car or kitchen cleaner.

因此，另外一种选择，就是询问人们愿意为安全程度更高的汽车或厨房洗洁精支付多少钱。

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So the third point is that we have increased and will continue to increase the percentage of cleaner alternative energy sources.

第三，大力发展清洁替代能源。

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Politicians these days, especially Senators Obama and Clinton, routinely bash the oil companies and call for more efforts to come up with cleaner alternative fuels.

FORBES: Fact and Comment

Once the bane of environmentalists, the nuclear industry enjoyed newfound "green" credentials as a cleaner alternative to coal-fired plants that belch greenhouse gases to produce electricity.

CNN: STORY HIGHLIGHTS

Nuclear fusion, a theoretical way of harnessing power by fusing atoms which is still under development, may one day provide a cleaner alternative to the world's energy problem.

BBC: Impact of global warming may be severe and wide-ranging