Global cooling was the big threat when i was in college in late 70s
And however much that was a fact (and I do remember the big concerns about Global Cooling) -- it was never presented as "Anthropogenic"... and it's "that" -- which is the primary and only problem here...
actually the coming ice age predicted in the 70s was very much considered pollution caused but never got the political grease it now has as a tool of envirowackos and as a segue for more socialist control and a transfer of wealth from the developed to third worlds:
From Time 1975:
Man, too, may be somewhat responsible for the cooling trend. The University of Wisconsin's Reid A. Bryson and other climatologists suggest that dust and other particles released into the atmosphere as a result of farming and fuel burning may be blocking more and more sunlight from reaching and heating the surface of the earth.