AdvertisementMeet the sargassum belt, a 5,000-mile-long snake of seaweed circling FloridaPlay02:29Download AudioMarch 15, 2023Emily OlsonfacebookEmailPeople 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)