https://www.bbc.co.uk/news/world-asia-66578158

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Japan will start releasing treated radioactive water from the tsunami-hit Fukushima nuclear plant into the Pacific Ocean on Thursday, despite opposition from its neighbours.

Some 1.34 million tonnes of water - enough to fill 500 Olympic-size pools - have accumulated since the 2011 tsunami destroyed the plant.

The water will be released over 30 years after being filtered and diluted.

"As long as the discharge is carried out as planned, radiation doses to people will be vanishingly small - more than a thousand times less than doses we all get from natural radiation every year," says Prof Jim Smith, who teaches environmental science at the University of Portsmouth.

Nuclear plants around the world regularly release waste water with tritium levels above that of the treated water from Fukushima.

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The irony is that the amount of radioactivity released will be less than what it would have been had the plant had remained operational.