Looks like ExxonMobil CEO Rex Tillerson dusted off Donald Rumsfeld's PR play-book in explaining Exxon's stance on global warming, here's the quote:

There's much we know and can agree on around the climate change issue, and there’s much that we just don’t believe we do know…and we want to have a debate about the things we know and understand, the things we know about that we don’t understand very well, and the things we don’t even know about around this very complex issue of climate science. So that will continue to be our position."

Thanks for clearing that up Mr. Tillerson.

Here's the youtube version with Rumsfeld's famous "known knowns" explanation of the Iraq war produced by the very clever folks at Sirotablog. [1]