I assume this must have been in discussion in academic circles even before the 1958 date given in the article, John von Neumann wrote this in 1955, and he wasn't even a proper climate scientist.

> "Carbon dioxide released into the atmosphere by industry's burning of coal and oil - more than half of it during the last generation - may have changed the atmosphere's composition sufficiently to account for a general warming of the world by about one degree Fahrenheit." (Can We Survive Technology?, Fortune magazine 1955)

I'm surprised this doesn't seem to have been taken particularly seriously back then even by government scientists.