But Dr Caldeira said that such a strategy should now be re-considered.

但是卡尔代罗博士说现在应该重新考虑这种策略。

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The warming effects of carbon dioxide as a greenhouse gas have been known for a long time, says Caldeira.

卡尔德拉说，二氧化碳作为温室气体而引起温室效应的说法由来已久。

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This latter idea is impractical, says Dr Caldeira, who reckons that half the world's deserts would have to be covered.

卡尔德拉博士指出, 后者的提议并不是切实可行; 如果那样的话, 那么全世界将近一半的沙漠地带都要建造这大型的反射器.

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But Tony Caldeira, chairman of the Liverpool Conservatives, said the country should remember Baroness Thatcher's achievements.

BBC: Margaret Thatcher death: Merseyside reaction

Ken Caldeira, an atmospheric scientist at the Carnegie Institution, puts the same point a different way.

ECONOMIST: Is it worth it?

Critics, including James L. Gibson and Gregory A. Caldeira, have charged that these studies systemically overestimate political ignorance.

NEWYORKER: The Commandments