"If people eat this kind of contaminated food, it will affect the health of millions and millions of people, for many, many years." Observers say Japan's discharging of nuclear-contaminated water into the ocean may pose long-term threats to human health and the marine environment.
I think you might want to rephrase that. The plan isn't really to "release contaminated water," but rather treated and diluted water.
Leftist spaces are also more likely to express backlash at anything that may contaminate the environment, with good reason. You need to consider your audience, and consequently, your rhetoric.