MSNBC's Shuster invited "Muckraker of the Day" Deroy Murdock to muck up global warming debate

SUMMARY: MSNBC's David Shuster allowed columnist Deroy Murdock to repeat the claim -- first made by climate change skeptic Martin Hertzberg -- that global warming is not occurring because "the Earth temperature has gone down 1.8 degrees Fahrenheit since 1997." Rather than challenge that claim, Shuster named Murdock "our Muckraker of the Day" and "congratulat[ed]" Murdock for "stirring the pot." But climate scientists warn against cherry-picking yearly temperature averages as purported evidence that global warming is not occurring, especially from years in which El Niño and La Niña events occurred, as Murdock and Hertzberg did.

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