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Japan said Tuesday that it would start pouring treated radioactive water(放射性废水) from the Fukushima nuclear power plant into the Pacific Ocean within two years. Officials in Tokyo said the water would be filtered and diluted(稀释) to safe levels first, but most residents remain firmly opposed to the plan. Protesters gathered outside Prime Minister Yoshihide Suga’s residence in downtown Tokyo to criticize the government’s decision.

More than a million tons of radioactive water is currently being stored at the Fukushima power plant in a massive tank farm big enough to fill 500 Olympic-sized swimming pools. The wastewater comes from water pumped in to cool the plant’s damaged reactors(反应堆). The government says it has simply run out of room to store all the water. The plan to dump the water into the ocean first came to light in the autumn of last year, when Japanese news reported anonymous officials said the decision had been taken.

On Tuesday, Suga said that after years of study, his scientific advisors had concluded that ocean discharge was the most possible way to cope with the wastewater. But the decision to pour Fukushima wastewater into the ocean has drawn fire from neighboring Asian countries and local fishermen along Japan’s coast.

China called the decision “extremely irresponsible,” and South Korea summoned(召唤) the Japanese ambassador in Seoul over the matter. “They told us that they wouldn’t release the water into the sea without the support of fishermen,” Kanji Tachiya, who leads a local cooperative of fisheries in Fukushima, told national broadcaster NHK ahead of the announcement on Tuesday. “We can’t support this move to break that promise and release the water into the sea unilaterally(单方面地).”

The actual release of water from the Fukushima plant will take decades to complete. Critics have called on Japan’s government to at least ensure that independent monitoring is in place to check the level of radiation in the poured water is safe for the environment.