For example. he has cited papers on paleoclimate that show, unsurprisingly, that CO2 sometimes trails the beginning of warming in a natural climate cycle. And this is what you would expect as the changes in the earth's orbit and other factors like vulcanism are what get us out of ancient ice ages, not the imposition of fossil CO2 by man. In a natural cycle the ball gets rolling by one of those other methods, and as the ice recedes, CO2 increases and helps it along. He is either too dishonest to admit, or too stupid to understand that, and he also denies that CO2 has any warming effect on the planet. In his world, if all the CO2 disappeared tomorrow, the planet would stay in the temperature range it is in now.