there were 2km of ice 10,000 years ago.  The ice age has been going on for 2.6 million years, since the opening of the arctic ocean when s america and antarctica split apart.  Ocean currents changed, the south pole was no longer warmed by tropical currents from the equator.  Ever since then, the ice has come and gone with predictable regularity, based broadly on the milankovitch cycles.  Cooling is a long slow process, building ice sheets very very slowly.  Warming is very abrupt,  ice sheets can melt away in a very short time, as little as a century.  The cycle follows a saw-tooth pattern, long cooling cycles with very fast spikes of warming.  Nature has us in a long cooling cycle right now, yet our temperature is spiking very very fast.  Volcanoes emit 300,000,000 tonnes of CO2 annually, humans emit 30,000,000,000 tonnes.  Enough to cover all of Russia in a one meter thick blanket, annually.  Snap out of your denial will you?