Held-Soden 2006: warming -> more water-vapor (Clausius-Clapeyron 7%/K) -> stronger greenhouse -> more warming; ~doubles direct CO2 forcing; largest positive feedback.
Held-Soden 2006: warming -> more water-vapor (Clausius-Clapeyron 7%/K) -> stronger greenhouse -> more warming; ~doubles direct CO2 forcing; largest positive feedback.