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Climate and Environment

    • Record amount of seaweed is choking shores in the Caribbean

    Seaweed covers the Atlantic shore in Frigate Bay, St. Kitts and Nevis, Wednesday, Aug. 3, 2022. (AP Photo/Ricardo Mazalan) Seaweed covers the Atlantic shore in Frigate Bay, St. Kitts and Nevis, Wednesday, Aug. 3, 2022. (AP Photo/Ricardo Mazalan)
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    SAN JUAN, Puerto Rico -

    Near-record amounts of seaweed are smothering Caribbean coasts from Puerto Rico to Barbados, killing fish and other wildlife, choking tourism and releasing stinky, noxious gases.

    More than 24 million tons of sargassum blanketed the Atlantic in June, shattering the all-time record, set in 2018, by 20 per cent, according to the University of South Florida's Optical Oceanography Lab. And unusually large amounts of the brown algae have drifted into the Caribbean Sea.

    A raggedy carpet of vegetation recently surrounded an uninhabited island near the French Caribbean territory of St. Martin that is popular with tourists, forcing officials to suspend ferry service and cancel kayaking, paddleboarding and snorkeling tours. The normally translucent turquoise waters around Pinel Island turned into a prickly yellowish-brown slush.

    Oswen Corbel, owner of Caribbean Paddling, said he had to close his St. Martin business on July 22 and doesn't expect to reopen until late October. He estimated he has lost at least US$10,000.

    "Maybe I should give up. ... Sometimes I think I should go into the mountains and herd sheep, but this is what I know to do," he said. "What's next? We had Hurricane Irma, we had COVID, we had the sargassum, and now I'm pretty scared of global warming."

    Scientists say more research is needed to determine why sargassum levels in the region are so high, but the United Nations' Caribbean Environment Program said possible factors include a rise in water temperatures as a result of climate change, and nitrogen-laden fertilizer and sewage that nourish the algae.

    "This year has been the worst year on record," said Lisa Krimsky, a university researcher with Florida Sea Grant, a program aimed at protecting the coast. "It is absolutely devastating for the region."

    She said large masses of seaweed have a severe environmental impact, with the decaying algae altering water temperatures and the pH balance and leading to declines in seagrass, coral and sponges.

    "They're essentially being smothered out," Krimsky said.

    The "golden tide" also has hit humans hard.

    The concentration of algae is so heavy in parts of the eastern Caribbean that the French island of Guadeloupe issued a health alert in late July. It warned some communities about high levels of hydrogen sulfide gas emanating from the huge rotting clumps of seaweed. The gas, which smells like rotten eggs, can affect people with breathing problems such as asthma.

    The Biden administration declared a federal emergency after the U.S. Virgin Islands warned last month of unusually high amounts of sargassum clogging machinery at a desalination plant near St. Croix that is struggling to produce water and meet demand amid a drought.

    In addition, the U.S. Virgin Islands' electricity generating station relies on ultra-pure water from the desalination plant to reduce emissions. The loss of such water would force the government to use a type of diesel fuel that is more expensive and in limited supply, officials said.

    Chuanmin Hu, an oceanography professor at the University of South Florida who helps produce the seaweed reports, said sargassum levels for the eastern Caribbean were at a near-record high this year, second only to those reported in July 2018. Levels in the northern Caribbean are at their third-highest level, he said.

    Experts first noted large amounts of sargassum in the Caribbean Sea in 2011, and the problem has occurred practically every year since then.

    "We don't know if this is a new normal," Krimsky lamented.

    Sargassum in moderation helps purify water and absorb carbon dioxide and is a key part of the habitat for fish, turtles, shrimp, crabs and other creatures. It is also used in fertilizer, food, biofuel, construction materials and medicinal products.

    But it is bad for tourism and the environment when too much accumulates just offshore or on beaches.

    "This is the worst we've ever seen it for sure," said Melody Rouveure, general manager for a tour company in the Dutch Caribbean territory of St. Maarten, which shares an island with St. Martin. "It did ruin my personal beach plans."

    On Union Island, which is part of St. Vincent and the Grenadines, the seaweed invasion has forced some resorts in recent years to close for up to five months.

    Masses of sargassum also have strangled the Caribbean's fishing industry. It damages boat engines and fishing gear, prevents fishermen from reaching their vessels and fishing grounds and leads to a drop in the number of fish caught. Barbados, where the beaches are piled with reddish-brown seaweed, has been hit especially hard.

    An overabundance of sargassum was blamed for the recent deaths of thousands of fish in the French Caribbean island of Martinique. It also has activists concerned about the plight of endangered turtles. Some are dying at sea, entangled in the seaweed or unable to lay their eggs because of the mat of algae over the sand.

    In the Cayman Islands, officials launched a trial program in which crews pumped more than 2,880 square feet (268 square meters) of seaweed out of the water. But on Tuesday, the government announced it suspended the project, saying the seaweed had decomposed so much that it had rendered the pumping useless.

    Some island nations use heavy machinery to remove seaweed from the beach, but scientists warn that causes erosion and can destroy the nests of endangered turtles.

    Many Caribbean islands are struggling financially and do not have the means to clear the vast amounts of seaweed.

    Gov. Albert Bryan of the U.S. Virgin Islands said he asked President Joe Biden to declare a federal emergency for the entire three-island territory, not just St. Croix, but that didn't happen. Bryan said he is now trying to find local funds to clean beaches, "but a lot of things need money right now."

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