Since 2011, the Caribbean region has been experiencing unprecedented influxes of the pelagic seaweed Sargassum. These extraordinary sargassum 'blooms' have resulted in mass strandings of sargassum throughout the Lesser Antilles, with significant damage to coastal habitats, mortality of seagrass beds and associated corals , as well as consequences for fisheries and tourism. Whether or not such events are related to long-term climate change remains unclear; however, it has been suggested that the influx may be related to strong Amazon discharge, enhanced West African upwelling, together with rising seawater temperatures in the Atlantic  . Since 2011, the Pacific atoll nation of Tuvalu has also been affected by algal blooms, the most recent being a large growth of Sargassum on the main atoll of Funafuti, and this phenomenon has been related to anthropogenic eutrophication and high seawater temperatures .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report