At this point, the world's climatologists are agreed.... Once the freeze starts, it will be too late.

Douglas Colligan, "Brace Yourself for Another Ice Age," Science Digest, February 1973.

This is my long-run forecast in brief:
The material conditions of life will continue to get better for most people, in most countries, most of the time, indefinitely. Within a century or two, all nations and most of humanity will be at or above today's Western living standards.
I also speculate, however, that many people will continue to think and say that the conditions of life are getting worse.
Julian Simon, 1997

Julian Simon, 1997
in Meadows, Donella Hager. I nuovi limiti dello sviluppo: la salute del pianeta nel terzo millennio. Milano: Oscar Mondadori, 2006.

The cooling has already killed hundreds of thousands of people in poor nations. It has already made food and fuel more precious, thus increasing the price of everything we buy. If it continues, and no strong measures are taken to deal with it, the cooling will cause world famine, world chaos, and probably world war, and this could all come by the year 2000.

Lowell Ponte, The Cooling, 1976.