I think that is an apt comparison and it just outlines the things to me. We really did not know smoking was bad till the 40's and the 50's is when it was much more conclusive and the industry was able to push off legislation for like a decade into the 60's. The greenhouse effect although known for awhile similarly did not really become conclusive till the 50's and still it was like the late eighties when congressional hearings brought it more into the us public sphere although many folk still did not really know about it till gores 2006 movie put it more into the common culture. The industry fud started with the congressional hearings when there was indication it might lead to regulation. So they have pretty effectively stalled it for the most part for over 30 years! In addition we have had some regulation and then had it pulled back. I think it really highlights the decline compared to before when you look at cigarettes compared to greenhouse gases.