In 1979, when oceanographer Sylvia Earle set the record for deepest untethered walk on the ocean floor (1250 feet), there were less than 100 ocean dead zones — oxygen-depleted areas that are devastating to aquatic life. Today, there are over 400. Earle will screen a short film and discuss her book The World is Blue: How Our Fate and the Ocean's Are One (National Geographic), which examines humanity's role in these and other oceanic changes.
Mon., May 10, 7 p.m., free (reservations required), Academy of Natural Sciences, 1900 Benjamin Franklin Parkway, 215-299-1043, ansp.org.
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