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L.A.’s Coast Was Once a DDT Dumping Ground. No One Could See It — Until Now

Not far from Santa Catalina Island, in an ocean shared by divers and fishermen, kelp forests and whales, David Valentine decoded unusual signals underwater that gave him chills.

Why Action on ‘Forever Chemicals’ Is Taking So Long

What do you do about lab-made chemicals that are in 99% of people in the U.S. and have been linked to immune system problems and cancer? Whose bonds are so stable that they’re often called “forever chemicals“? Meet PFAS, a class of chemicals that some scientists call the next PCB or DDT. For consumers, they are best known in products like Scotchgard and Teflon.