Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Great Lakes Areas of Concern from the soil and them flow into streams and lakes. As more acid is released into the environment, more aluminum is also released. There are some plants and animals that are able to tolerate acid rain and moderate amounts of aluminum, but others are not as tolerant and will start to die off as the pH decreases. One of the biggest contributors to acid rain is the burning of coal and fossil fuels. Great Lakes Areas of Concern Great Lakes Areas of Concern are designated geographic areas within the Great Lakes Basin that show severe environmental degradation. There are a