You really can’t have it both ways though. You guys insist on factoring El Nino, la Nina activity as part of the man-made contribution to warming (through the argument that man made global warming is causing more El Ninos). Either, this is a source of natural global temperature variation or it is not, and the AGW crowd should have acknowledged the correct answer to this question long before now.
First, it isn’t proved that AGW will cause more El Ninos. All ENSO does is move energy from the oceans to the atmosphere and vice versa. When you account for ENSO, you get about the same amount of warming since the 1970s (El Nino accounts for about 0.06 deg, but it’s a difficult analysis and I don’t put much stock in that number). But if the earth warms, it makes sense that the warming would manifest itself, in part, through ENSO.
