Use google sometime and learn more about your own environment, Fresh water is likely to become a more important commodity than oil.
Here is a good start,
http://www.great-lakes.net/teach /
Snip>The Great Lakes--Superior, Michigan, Huron, Erie and Ontario--and their connecting channels form the largest fresh surface water system on Earth. North America from space. If you stood on the moon, you could see the lakes and recognize the familiar wolf head shape of Lake Superior, or the mitten bounded by lakes Michigan, Huron and Erie.
The Great Lakes, in their current state, are actually one of the youngest natural features on the North American continent. Covering more than 94,000 square miles and draining more than twice as much land, these Freshwater Seas hold an estimated 6 quadrillion gallons of water, about one-fifth of the world's fresh surface water supply and nine-tenths of the U.S. supply.
Fun Facts
Spread evenly across the contiguous 48 states, the lakes' water would be about 9.5 feet deep.
All five of the Great Lakes are among the world's 18 largest lakes by area and volume.
The Great Lakes and islands within them have more than 10,000 miles of coastline.<snip