Climate Change

They also want to know how it can be stopped.
He says he doesn't "want to overreact" to global warming.
The Earth is on track to beating 2014 as the hottest year ever recorded.
Clinton's top campaign financiers are linked to Big Oil, natural gas and the Keystone pipeline.
"We still have to run our economy, we still have to turn on the lights."
The former vice president says the drilling "ought to be banned."