dead zones

World Resources Institute

Growing populations and increasing pollution are contributing to more and more “dead zones” in bays and oceans around the world.

Now there’s an interactive online map pinpointing more than 760 spots across the globe—including 22 in Washington – that either are dead zones or are in danger of becoming one.

What’s a “dead zone?”

It happens when excess nutrients in the water help trigger an algae bloom. Mindy Selman explains that when all the algae die, they sink to the bottom.