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As concerns grow over climate change and high oil prices, the U.S. and Europe are starting to build new nuclear power plants, after decades of favoring other energy sources. WSJ's Matthew Dalton explains why those nations have lost some of their expertise in building nuclear plants, causing significant delays.Further reading -Nuclear Power Is Poised for a Comeback. The Problem Is Building the Reactors  Learn more about your ad choices. Visit megaphone.fm/adchoices

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