claim: His best estimate is that the  warming in response to a doubling of CO2 concentration, which may happen  this century unless the usual suspects get away with shutting down the  economies of the West, will be a harmless 1 Fahrenheit degree, not the 6  F predicted by the IPCC."
evidence: This is much colder than the conditions that actually exist at the Earth's surface (the global mean surface temperature is about 14 °C).