Scientists have discovered that satellite sensors used to measure the area of arctic sea ice drifted out of calibration creating an error of about 500,000 square kilometers (roughly the size of the state of California). The sensor drift reportedly started sometime in early January and was just recently caught. They do say that this is expected and that they account for it before reporting their findings to Al Gore. Okay, they don't likely report directly to big Al, but you get my drift. Read more here.
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