Beware the faux skepticism.
That the world has warmed over the 20th. century is not in question, though the exact degree of warming and the accuracy of the temperature record might be. Muller however , has only demonstrated a correlation between CO2 in the atmosphere and temperature that has long been established from the paleoclimatic record.
This is nothing new and as he says himself it doesn't establish causation.
CO2 has been known to rise with temperature as the warming oceans release CO2 naturally.
A continuing steady rise in CO2 has not resulted in further warming over the past 15 years however, which tends to suggest it is not the cause.
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