Chris You put alot of time into your response and I appreciate that however, the total W/m2 I posted was a direct copy paste quote from the IPCC Ch. 2. They clearly state that for the first time .... ALL human caused ghg = 1.6 W/m2 with the variable of -1. to +.8. I also posted the estimated total of ALL natural ghg equivalent of 150 W/m2 with the link to the source. As far as the water vapor explanation, while making sense to a point it is easily cast into doubt by what happens in deserts at night compared to the temps during the day. The one thing that is missing is water vapor. "Water vapor H20 is by far the most important greenhouse gas (accounting for 95% of greenhouse gasses). It accounts for about 30°C* of the 36°C increase in earth's surface temperature due to the combined influence of all greenhouse gasses." http://oceanworld.tamu.edu/resources/oceanography-book/radiationbalance.htm *a florida edu stated water vapor is 33C, but I closed the window before copying link location. We are (by best guess) 1/3 to 1/2 way thru our current warming before the next Ice age occurs (based on past record). It is not surprising to me that the climate is warming at this point.