Support WBURMeet the sargassum belt, a 5,000-mile-long snake of seaweed circling FloridaPlay02:29Download AudioEmily OlsonMarch 15, 2023 SharePeople remove Sargassum in Playa del Carmen, Mexico, in April, 2022. Researchers expect this year will bring another massive bloom, choking local ecosystems and tourism economies. (AFP via Getty Images)