(New Scientist) It will take until March 2015 to build, cost $320 million and use enough power each day to run 3300 Japanese households. Yet the country’s government this week decided a wall of ice is the best solution to stem the flow of radioactive water leaking from Fukushima Daiichi’s four stricken nuclear reactors.

The wall is the centrepiece of a $470 million drive to stop 400 tonnes of groundwater being contaminated every day. It is currently being stored in an ever-increasing number of huge tanks.

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