The Ohio River, which supplies drinking water to millions of people, is endangered Ten rivers across the country make one conservation group's list of most endangered rivers, including the Ohio River.

The Colorado River, which carved the Grand Canyon over millions of years, is now in crisis from climate change and overuse. Skip to content Skip to site index.

Human-caused climate change has shrunk the amount of water in the Colorado River Basin by more than 10 trillion gallons since 2000, according to a recent study. CNN values your feedback 1.