roy spencer he is funded by department of energy, an asset, you collect measurements in the atmosphereago monitor temperatures from satellite. >> it is warming? >> has over 33 years. but then it stopped over the last 10 years which is a dirty little secret. john: greenhouse gases are a real threat. why not regulate carbon dioxide? >> i am lukewarm. one of the scientists that think adding co2 should add some warming but how much? some think is dangerous. and controllable warming in the future but we think it could be natural and we could see little warming. it comes down there is enough to human health and welfare. john: you don't think there is? >> no. from the economic standpoint, if you reduce her images produced, virtually all human activities require co2. carbon based fuel as a byproduct, no easy way to remove it. coal-fired power plants, there is no way to get rid of the co2. >> shutdown civilization. then we outlaw all jobs not just another segments but everything. john: if we could do this, would make any real difference terms of global warming assuming it is accurate? >> no. we