Fact-checking the latest global warming denial campaign.

When NASA’s Goddard Institute for Space Studies recently announced that it was revising its temperature data, right-wing bloggers leaped at the news to propel its global warming denial campaign. James Hansen — head of the NASA center — sets the record straight. He writes that the “corrected and uncorrected curves are indistinguishable,” adding that the “deceit” propagated by the right “has a clear purpose: to confuse the public about the status of knowledge of global climate change.”