UNESCO’s Intergovernmental Oceanographic Commission (IOC) has partnered with the United Nations Environment Programme (UNEP), the Global Partnership on Nutrient Management (GPNM), the IOC-SCOR GlobalHAB Programme and the Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP) Task Team on Sargassum to organize a series of webinars on Sargassum in the Caribbean and West Africa.