3.5 mil years ago, summer temps were ~8°C warmer than today, CO2 was ~400 ppm Gallery 3.5 mil years ago, summer temps were ~8°C warmer than today, CO2 was ~400 ppm Atmosphere, Climate Change, Science, Soils, Temperature 3.5 mil years ago, summer temps were ~8°C warmer than today, CO2 was ~400 ppm Two recent studies on past temperatures. By CLIMATE STATE|2025-02-12T19:09:27+01:00May 10, 2013|Categories: Atmosphere, Climate Change, Science, Soils, Temperature|Tags: 2013, Arctic, Climate Model, Climatology, Pleistocene, Pliocene, Polar Amplification, Russia, Study, Temperature|0 Comments Read More