QUESTION: Fracking can lead to environmental pollution including, but not limited to, the contamination of water supply. Do you support fracking?
COOPER: Secretary Clinton?
CLINTON: You know, I dont support it when any locality or any state is against it, number one. I dont support it when the release of methane or contamination of water is present. I dont support it number three unless we can require that anybody who fracks has to tell us exactly what chemicals they are using.
So by the time we get through all of my conditions, I do not think there will be many places in America where fracking will continue to take place. And I think thats the best approach, because right now, there places where fracking is going on that are not sufficiently regulated.
So first, weve got to regulate everything that is currently underway, and we have to have a system in place that prevents further fracking unless conditions like the ones that I just mentioned are met.
COOPER: Senator Sanders, you...
SANDERS: My answer my answer is a lot shorter. No, I do not support fracking.
(APPLAUSE)
...
COOPER: Senator Sanders, though ... to Secretary Clintons point, there are a number of Democratic governors in many states who say that fracking can be done safely, and that its helping their economies. Are they wrong?
SANDERS: Yes.
(APPLAUSE)
http://www.nytimes.com/2016/03/07/us/politics/transcript-democratic-presidential-debate.html