by Tony Heller, July 4, 2017

Venus is hot because it has an atmospheric pressure almost 100X that of Earth. The same reason why the top of the Grand canyon is cold, and the bottom of the Grand Canyon is hot. Temperatures in Venus troposphere at the elevation where pressure is 1 bar, are similar to earth.  Only a complete moron would believe that adding 0.0001 mole fraction CO2 to the atmosphere would cause that.