Let's pray for objective "settled science" regarding global warming. A massive new book by Pullitzer prize-winning author Steve Coll, "Private Empire," reveals that the global giant ExxonMobile hired scientists to undo and refute global warming data that was being compiled by other scientists. ExxonMobile nows says climate crisis is "very serious" and is calling for a tax on carbon as one of the only ways to halt global warming. Here is a Marketplace summary interview.