Grist: When listening to the garbled blender noises that come out of politicians or businessmen when theyre denying the scientific consensus on climate change, its natural to be frustrated, angry, even irate. But can you sue them? Environmentalists and their allies in Congress are putting pressure on the Department of Justice to consider its options. In a letter sent last October, two Democratic congressmen asked the Department of Justice to investigate ExxonMobil for decades of promoting climate denial,...