An Associated Press investigation published last month found scores of potentially troubling dams located near homes and communities across the country.
Speaking in a coffee shop in Keokuk, Iowa, O'Rourke painted a dour picture of the future, but urged those around him to "find a way to do this," noting that "literally the future of the world depends on us, right now."
Washington Gov. Jay Inslee (D), who announced a 2020 presidential bid last week, said Sunday that there will be an "enormous cost" if the U.S. does not act to combat climate change.
Potential Democratic presidential candidate Sen. Kirsten Gillibrand (D-N.Y.) said she supports the "Green New Deal" proposal to shift the nation to renewable energy to fight climate change.
