From WUWT blog I learned that La Nina is back. Since I am not much of an expert (hardly even a layman) on the Pacific Decadal Ossilation and all that I had to wikipedia it. The keys are, that while El Nino spawns from warming in ocean surface temperatures, La Nina is the opposite. What does this mean, well among other things El Nino is bad for Rocky Mountain Skiing, La Nina good.
So with all this Global Warming how can things like a cooling La Nina happen?
answer: nobody seems to know
Climate Skeptic has a good post on what the relevant questions are.
-Is this upward trend unique or is it within the range of normal natural fluctuations?
-Is this trend exaggerated by upwards biases in surface temperature measurements?
-What proportion of this trend is due to anthropogenic factors (e.g. Co2) and what proportion is due to natural variations (e.g. unusually strong solar cycles in late 20th century)?
-How can one reconcile the trend over the last 100 years with climate models, which use assumptions that imply that past warming should have been much higher?
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