Geologist Ian Plimer is asking some dangerous questions about "global warming." Quick, someone alert the fact checkers! "If you started measuring in the 1850s, there's been a general warming of about 0.7 degrees Celsius... If you started to measure from the medieval times, we've had a cooling of about four degrees Celsius... So if you're telling me that the planet's warming, my question is, since when?" | Young Americans for Liberty