in the arcticle that you cowrote with a group financed in part by oil companies, you say this. this sumes that carbon is a problem and in need of regulation. we checked on your congressional website. on the website you said. i trongly everything should be on the table as we seek to reduce carbon and emission. chimate change is a serious problem. >> is carbon a problem. what is your solution . >> we want to do it in a reasonable way. our country is going to need 30 or 40 percent more electricity than we use today. we need all of the above. clean coal and natural gas and nuclear. something that has not happened. >> we need to regulate carbon. >> we don't have to regulate carbon to a carbon tax or cap and trade system.