What is a Purple Sea Urchin (and why should you care)?
March 31, 20215:03 AM ET Lauren Sommer Purple sea urchins have exploded in recent years off California, covering the ocean floor in what divers describe as a “purple carpet.” And they devour kelp: the once-lush forests of seaweed that hugged the coastline are disappearing. Since 2014, 95 percent of the kelp have vanished across a…
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