Travel Harmful blue-green algae prompts beach closures, warnings in Vermont, Rhode Island, Ohio July 15, 2021 Joel Banner Baird and Jayme Deerwester, Burlington Free Press Comments Off on Harmful blue-green algae prompts beach closures, warnings in Vermont, Rhode Island, Ohio Toxic cyanobacteria, also known as blue-green algae, has resulted in beach closures and warnings to avoid lakes in Vermont, Ohio and Rhode Island.