Carbon-capture-and-storage technology buries carbon dioxide underground instead of releasing the harmful greenhouse gas into the air. However, some environmentalists say the clean-coal technology may prove more expensive than alternative energy. "The concept is being used as an excuse to build more coal-fired power stations," said Stephanie Tunmore, climate campaigner for Greenpeace. However, the United Nations' top climate official, Yvo de Boer, said the technology is "critical" for countries such as China that will continue to use coal.

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