Hansen Says That CO2 Feedback Is Critical For An Ice Age To Occur | Real Science

CO2 needs to get very low to have an ice age (i.e. 200 ppm) – which is why the Ordovician had an ice age at 4,000 ppm.

The Climate Sceptics (TCS) Blog: A little levity from the Carbon Sense Coalition


Hansen 1986 : Earth To Bake By 2006 | Real Science

October, 1871 [The good old days, when CO2 was at safe levels]: Peshtigo Fire Burned 1.5 Million Acres And Killed 2,000 People | Real Science