As cleanup of the 2011 Fukushima disaster continues, the Japanese government made its case to embassy officials from 23 countries Monday that dumping contaminated water from the nuclear power plant into the ocean is the best course of action.

According to Kyodo News, officials from the Ministry of Economy, Trade, and Industry claimed releasing the water and evaporating it are both "feasible methods" but said the former could be done "with certainty" because radiation levels could be monitored.

There's more than one million tons of contaminated water already stored at the plant, with 170 tons more added each day. Utility TEPCO says there will be no more capacity for tanks holding contaminated water by 2022.

As Agence France-Presse reported, "The radioactive water comes from several different sources—including water used for cooling at the plant, and groundwater and rain that seeps into the plant daily—and is put through an extensive filtration process."

That process still leaves tritium in the water and "has been found to leave small amounts of other radioactive materials," Kyodo added.

The session for embassy officials followed Friday's recommendation by a Japanese government panel that releasing the water into the ocean was the most feasible plan. As Reuters reported Friday:

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The panel under the industry ministry came to the conclusion after narrowing the choice to either releasing the contaminated water into the Pacific Ocean or letting it evaporate—and opted for the former. Based on past practice it is likely the government will accept the recommendation.

Local fishermen oppose the plan and Reuters noted it is "likely to alarm neighboring countries."

They're not alone.

Nuclear policy expert Paul Dorfman said Saturday, "Releasing Fukushima radioactive water into ocean is an appalling act of industrial vandalism."

Greenpeace opposes the plan as well.

Shaun Burnie, a senior nuclear specialist the group's German office, has previously called on Japanese authorities to "commit to the only environmentally acceptable option for managing this water crisis, which is long-term storage and processing to remove radioactivity, including tritium."