After 15,000 years, it's waking up

so you're saying that before man kind there was so little ice in the arctic that Buffalo were common. hmmm makes me think that once upon a time there was little to no ice on earth like when dinosaurs were here in the early days. I'm guess the greenhouse effect caused by the warm period making the atmosphere thick resulted in dramatic drops in temperatures. though I know other things have caused massive extinction events and caused massive cooling without the random events it must happen naturally where the earth warms making the atmosphere thicker then a wet period followed by a ice period followed again by a mild arrid period and then a new ice age. no I don't have a college degree this is literally the observations of a HS graduate. I'm sure it's more complex but in simple terms it seems like a cycle that is pretty normal, though I'm guessing like a perpetual energy machine it will eventually run out of the ability to keep doing this. also guessing it is like Sublimation.