I don't support CO2 pollution, but yes, the period of the Younger Dryas experienced global shift of 2.5 degrees celsius within hundreds, or perhaps possible sin

I don't support CO2 pollution, but yes, the period of the Younger Dryas experienced global shift of 2.5 degrees celsius within hundreds, or perhaps possible singles of years, of presumed natural causes. > http://www.realclimate.org/index.php/archives/2010/07/revisiting-the-younger-dryas/ http://www.realclimate.org/index.php/archives/2010/07/revisi...