| http://www.w3.org/ns/prov#value | - Is there such a thing as clean energy, really?ELIZABETH KOLBERT: Well, that is a really good question.And you noticed that, in the president???s speech, he listed so-called clean coal, which some people would say is an oxymoron and some people would say is an important tool in the arsenal of tools that we need to combat climate change.
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