Do you take the Great Lakes for granted? Do you think that because you live near the largest, surface freshwater system in the world, your access to clean water is limitless? If so, you’re not alone. Too many people believe that water is a renewable resource (it isn’t) or that it’s easy to fix pollution problems caused by human activities. How else can you explain the serious threats to the Great Lakes, which 40 million U.S. and Canadian citizens and countless wildlife depend on for survival? Exploitation of the Great Lakes in the 1900s left many areas seriously degraded. Anthropogenic pollution (caused by humans) is once more contributing to the decline in the health of the Great Lakes especially Lakes Erie and Ontario.