In 1975 the American climatologist Wallace Broecker published a paper in the journal Science, entitled “Are We on the Brink of a Pronounced Global Warming?” There he correctly predicted “that the present cooling trend will, within a decade or so, give way to a pronounced warming induced by carbon dioxide,” and that “by early in the next century [CO2] will have driven the mean planetary temperature beyond the limits experienced during the last 1,000 years.”