"The brilliant Serbian mathematician Milutin Milankovitch explained how our world warms and cools on roughly 100,000-year cycles due to its slowly changing position relative to the Sun. Milankovitch’s theory suggested Earth should be just beginning to head into its next ice age cycle. The surface temperature data gathered seemed to agree; the record showed that Earth experienced a period of cooling (by about 0.3°C) from 1940 through 1970....."
"But other scientists forecasted global warming... they had also observed the three-decade cooling trend... and predicted the cooling would soon switch to warming due to rising human emissions of carbon dioxide.... thus expressing the notion that humans could override nature and force the globe to warm..."
Earth is cooling... No, It's Warming
Milankovitch Cycles and Glaciation