What is that green slime on my lake?

The green slime is caused by Cyanobacteria. They are found almost everywhere on Earth, but now due to our actions that are warming the planet and altering water quality, they are blooming more frequently and poisoning our lakes and rivers in the process.

Causes and Cures for Green Aquarium Water

Blue-Green Algae Control in Ponds - Does your pond look like pea soup?

botany - Are Pond Algae Edible for Humans? - Biology Stack Exchange

How to control algae and green water in your pond

Lake Okeechobee's Toxic Algae Blooms Threaten Florida and Could Get Worse - The New York Times

How to identify and kill blue-green algae (In just days!)

Climate Change And Lakes That Look Like Pea Soup - Field Museum

What's this Ugly Film Covering your Pond? - Magnolia Fisheries

Headed to a lake or river today? Look out for blooming harmful algae! - Washington State Department of Ecology

How to Get Rid of Algae in Dams - Water Quality Solutions

Some Lake Erie anglers consider algae blooms helpful — but what are the health implications?

Toxic algae cocktail brews in Lake Erie

Blue-green algae - Government of Nova Scotia, Canada

How to Control Blue-Green algae - AquaPlant: Management of Pond Plants & Algae

What is that green slime on my lake?, Science Museum of Minnesota