One thing I would say on the subject of international leadership is that most—in fact, all, I think—of the international organizations have looked at this thing. IPCC, the UN, various...and, I believe, even the IEA has looked at it, and said that one of the best mechanisms, one of the essential mechanisms for the global response to climate change is going to be a price on carbon. There is pretty widespread, non-partisan agreement that it is a key instrument.
On October 30th, 2018. See this statement in context.