https://motherboard.vice.com/en_us/article/3k93mn/desalination-produces-50-percent-more-toxic-brine-than-previous-thought-study-finds

Factories around the world are pumping out toxic brine at a rate much higher than previously estimated and dumping it back into the ocean, according to a report published on Monday.

This super-salty brine is toxic to marine life, and as many nations become more dependent on desalination to supply drinkable water to their citizens, the report argues that this form of water purification could be a serious environmental hazard.