Stories

Erin Ross Jul 27
SaveSave story

Study: Expect more toxic algal blooms and dead lakes

In 2014, an algal bloom in Lake Erie caused authorities to turn off tap water

As the climate changes, dead zones in lakes and oceans could increase in size, while toxic algal blooms and "red tides" could become commonplace, according to a new study. The paper, published Thursday in the journal Science, suggests increased rainfall will cause more nitrogen from fertilized fields to enter waterways around the world.

What they found: All told, the total nitrogen runoff is expected to increase by 19% for the continental US, and other regions around the world are vulnerable as well.The impacts of this increase are predicted to be especially strong in the Northeast and Midwest U.S., India, China, and Southeast Asia.

Why it matters: "When we think about water sustainability, it's not just enough to think about the quantity of water. It's also the quality of water," Anna Michalak, an earth scientist at the Carnegie Institution for Science, in Stanford, California, and an author on the study, tells Axios. Nitrogen runoff can destroy lakes and cause toxic algal blooms that close beaches, kill animals and shut down fisheries, causing massive economic damage.