![]() ![]() Colleague David Keeling sets up first continuous monitoring of CO 2 levels in the atmosphere. ![]() Some climatologists predict a new ice age.ġ957: US oceanographer Roger Revelle warns that humanity is conducting a “large-scale geophysical experiment” on the planet by releasing greenhouse gases. ![]() Scientific interest in greenhouse effect wanes. Some scientists see the American Dust Bowl as a sign of the greenhouse effect at work.ġ940 to 1970: Worldwide cooling of 0.2☌. 1890s to 1940: Average surface air temperatures increase by about 0.25 ☌. ![]()
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