Climatologists are pessimistic that political leaders will take any positive action to compensate for the climatic change, or even to allay its effects. They concede that some of the more spectacular solutions proposed, such as melting the Arctic ice cap by covering it with black soot or diverting arctic rivers, might create problems far greater than those they solve... The longer the planners delay, the more difficult will they find it to cope with climatic change once the results become grim reality.
From: Newsweek: The Cooling World (April 28, 1975)
The science was settled in 1975.
Meet the new alarmists, same as the old alarmists.
The myth of the 1970s global cooling scientific consensus
Particular note should be paid to the discussion of Rasool and Schneider (1971).