Democratic presidential candidates Bernie Sanders, Elizabeth Warren, Joe Biden and Michael Bloomberg have talked about stricter regulation or outright bans on hydraulic fracturing. Meanwhile, President Donald Trump has opened up millions of acres of public land to fracking.

“We have an obligation to help people understand how fracking actually works,” Wirth said during an interview on Bloomberg TV. “And look, if there are things that need to be done to help regulate it even better we can talk about that as well.”