38751c01_ate_Science_Myths___PlanetSave__One_Liner
[0] 140 [Skeptic Argument] “CO2 was higher in the late Ordovician” [3] During the Ordovician, solar output was much lower than current levels. Consequently, CO2 levels only needed to fall below 3000 parts per million for glaciation to be possible. The latest CO2 data calculated from sediment cores show that CO2 levels fell sharply during the late Ordovician due to high rock weathering removing CO2 from the air. Thus the CO2 record during the late Ordovician is entirely consistent with the notion that CO2 is a strong driver of climate. [One Liner] 
The sun was much cooler during the Ordovician.
119 One-Liners to Respond to Climate Science Myths | PlanetSave
One Liner