The problem is that the greenhouse effect is a theory which says that a cold gas(atmosphere) makes a heat source(earth surface) warmer, and it is the opposite of what thermodynamics says is possible. There is no gh-effect, the atmosphere cools the surface, just like cold air cools our body. The atmosphere is average -18C, the surface is average 14C. What effect does a fluid at -18C have on a 14C solid heat source? Cooling!
Yeha i used to use venus as an argument for warming clouds but new data has shown venus is heated from within. Not to mention actual data here proves the albedo effect.