The Susquehanna River, which flows from New York into the Chesapeake Bay, was the most endangered American river in 2011. According to the environmental group "American Rivers", natural gas development was the primary cause. Other reasons rivers are endangered – meaning their fate can be determined within one year - are mining, sewage pollution, development, overuse and poor planning. Filling out the top 5 most endangered rivers were Bristol Bay (Alaska), Roanoke River (Virginia and North Carolina), Chicago River (Illinois) and Yuba River (California). In many cases we've made our "riverbeds", but we don't have to lie in them.
In 2011 the most polluted American city – according to the American Lung Association – was
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