Concerns outside of Canada and the US. For US-Canadian concerns, see binational concerns.
Article: 7 Things You Need To Know About The Toxin That’s Poisoned Ohio’s Drinking Water (Global Possibilities)
“It’s not just the U.S., either. Brad Plumer at Vox pointed out a 2012 paper in the Polish Journal of Environmental Studies which noted that toxic algae blooms have also shown themselves in China, Japan, Brazil, and Australia. Researchers there called the worldwide increase in blooms “one of the most serious health risks of the 21st century.”