we knew about it WHEN?

Clarence's color grew very high and he looked dazed. He paid no attention to his broiled meat and French fried potatoes. "I don't keep up much with science," he said. "I remember I did read somewhere that industry gives off six billion tons of carbon dioxide every year and so the earth is growing warmer because the carbon dioxide in the air is opaque to heat radiation. All that means that the glaciers won't be coming back."

from Saul Bellow's "The Gonzaga Manuscripts"

PUBLISHED IN 1954