Over 3 billion years ago the first life forms appeared on the earth these were the blue green algae algae provide over 80 of the oxygen for our planet and provide a staple diet for countless plants and animals one of the most potent of the blue greens is upper klamath algae known as aphanizomenon flos aquae or afa a wild sweetwater algae growing only in upper klamath lake oregon usa this is one of the largest pure alkaline lakes in the world nestled high in the cascades and fed by