Okay, once more on Ice cores.
Ice cores have demonstrated that the earths climate and atmospheric contents goes through cycles, and that there are spikes and pits in just about every variable that can be measured.
But nowhere in the ice core record is there recorded such a precipitous and steady rise in green house gases in just a few centuries as is contained in cores covering the period of the last millennium. Further, the ice cores demonstrate a direct correlation to the rise of industry and burning of fossil fuels. So the ice cores are one piece of direct evidence that human activity is responsible for a rise in green house gases and the rise in global temperature.
So the ice cores are indeed an inconvenient truth. Just not the way the scientifically ignorant climate change deniers would have the world believe.