Containing one-fifth of Earth’s surface freshwater, the Great Lakes provide water for 30 million people and are home to over 3,500 plants and animals. What were the ancient Great Lakes like, and how have they changed over the years? What factors put stress on this fresh water system, and how can you help protect them? Join staff to celebrate the 54th annual Earth Day and learn how you can protect our Huron, Ontario, Michigan, Erie, and Superior.