The greenhouse gas (water vapor) that produces 95% of the 'greenhouse effect' near the surface is also the component in the atmosphere that sets the lapse rate. The supposed amplification of AGW by the increase in the concentration of water vapor by an increase in the concentration of CO 2 is contradicted by the measurements taken by radiosondes of temperature changes in the atmosphere, which clearly show that an increase in the concentration of water vapor causes the temperature of the surface to fall rather than rise.