secondly, i do think this nation has to cut its dependence on fossil fuels connacht's carbon-based fuels. i think there should be a tax on carbon. i think we should put a tax and oil and gas and the burning of coal so that we do a little bit less of it. and just rebate the money to the people so you are not pocketing the money, but say we need to put a tax on carbon so that we move away from oil and coal and other things that contribute to global warning -- warming or contribute to the loss of the wetlands when there is an oil spill. >host: douglas brinkley writes an opinion piece echoing what mr. isaacson has been saying about redoing the army corps of engineers layout for the wetlands and the mississippi river. guest: doug brinkley is great. he is a great scholar. his piece lays it out perfectly. many others have been working on it. let's flesh it out. let the water from the mississippi still go down there. let's do all we can to go down there. people in this town have a lot more courage and common sense and sometimes given credit for. -- than sometimes given credit for. their cost are