Fukushima Power Plant: 'How Serious is This?'

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There are four different sources of leaking radiation from the damaged nuclear reactors at the Fukashima Diaiichi complex in Japan. The Japanese government, the Tokyo electric Power company and foreign governments monitoring the situation as well as international nuclear agencies seem to have conflicting information on the level of danger and the appropriate response. Takeaway listeners have concerns as well. David Biello, associate editor of environment and energy for Scientific American magazine, answers your questions.