Imagine if there were no reliable records of global surface temperature. Raucous policy debates such as cap-and-trade would have no scientific basis, Al Gore would at this point be little more than a historical footnote, and President Obama would not be spending this U.N. session talking up a (likely unattainable) international climate deal in Copenhagen in December. Steel yourself for the new reality, because the data needed to verify the gloom-and-doom warming forecasts have disappeared. Or so it seems. Apparently, they were either lost or purged from some discarded computer. Only a very few people know what really happened,...