ANOTHER UPDATE: More here: "Will the mainstream media report the corrected story with as much gusto as they initially reported the claim that 1998 was the warmest on record? Doubtful. But they should. Good public policy can not be made on bad data."
MORE: This comment at Ecotality distinguishes hottest years in America from hottest years globally, but I always understood this to be about American, not global, records. And I think I was right. As I noted in my earlier post, it indicates problems with the data sets. More here:
The GISS today makes it clear that these adjustments only affect US data and do not change any of their conclusions about worldwide data. But consider this: For all of its faults, the US has the most robust historical climate network in the world. If we have these problems, what would we find in the data from, say, China? And the US and parts of Europe are the only major parts of the world that actually have 100 years of data at rural locations. No one was measuring temperature reliably in rural China or Paraguay or the Congo in 1900. That means much of the world is relying on urban temperature measurement points that have substantial biases from urban heat.