Thank you for the link. I suspected it went back further than 1959, but could not come up with a publication for it. I should have searched wikipedia. I had a great interest in the Ice Age in my youth. Most of the books I read on the subject were older than 1959. The idea that the Ice Ages were caused by the green house effect was quite prominent in most of them. They did not extrapolate it to industrial, Agriculture, and individual pollution. Though I do recall a theory I read that the Agricultural Revolution is what ended the last Ice Age.