Man sat in a hot spring in Japan
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Hot spring solution for Japan's energy problem

Japan has long talked about renewable energy, but what was once a luxury has now become an urgent necessity.

Two-thirds of the country's nuclear reactors are offline, amid safety fears following the disaster at Fukushima.

Some scientists are urging the government to consider an over-looked resource - the hot springs generated by the fault lines under the country.

Roland Buerk reports.