Filmmaker Robert Kenner Deals with "Merchants of Doubt"

What do "merchants of doubt" do? The question arises now that Robert Kenner has come out with Merchants of Doubt. Like his Oscar-nominated documentary, Food, Inc., this engrossing new exposé once again sounds a caveat emptor for American consumers, only this time the beef is purveyers of spin and the threats they pose to Earth's survival. It's hard to say who is more outrageous, the individuals who peddle skepticism about climate change or the industries that adv...