Drik wrote (12:42 PM)
"None of the models are able to take the effect of clouds into consideration. Also none of them are able to take the effect of fluctuation of solar radiation and its effect on the formation of clouds into effect. Over the last 140 years global surface temperatures have risen by about 0.8ºC, if you start measuring at the end of the Mini-Ice age of the end of the last millennium."
Nor do those models take into consideration water Vapor (humidity) which is a stronger "green house gas" than CO2. Why, you cannot control it. Further the data used to "show" the "trend" is not from the same sources under the same conditions other than natural weather variations.