Here's some stuff to think about...
AFTER the last Ice Age, when all the continental ice sheets melted (about 8,000 to 6,000 years before present), average air and ocean temperatures were 6 to 8 degrees warmer than now. Think about that for a moment, an ocean is a pretty big chunk of water to warm up that much!
Many species completely disappeared during that intense warming period. No more sabre tooths, no more giant camels, no more mastodons, no more mammoths, no more giant cave bears, no more Neanderthals (well there still are a few around here, but we'll ignore that for the moment), the list goes on ad infinitum. We may well see a few more species disappear before this warming trend runs it's course - maybe ourselves for example!
Before modern times (but during this inter-glacial period), the forests and grasslands of the temperate parts of the world caught fire almost annually, and without modern technology and population density to put them out, burned until winter conditions put them out. The annual smoke palls most have been choking, rather like the Burns Bog fire here a few weeks ago! We have not come close to creating that kind of particulate matter pollution except in a few limited areas. However, we have created some other rather nasty types of air pollution that only existed in small amounts in history.
For the last quarter of a million years or so, the earth has been in glacial periods a considerable amount more than in inter-glacial periods (can't remember the percentage offhand, and too lazy to look it up). So we are in reality in a predominantly glacial period, but in an inter-glacial phase of it. So the overwhelming odds are that we will actually be headed INTO a period of intense glaciation once this inter-glacial period runs its course (no saying how long that will be, but it won't happen next week).
So don't buckle on the ski boots quite yet, but don't be in a great panic about global warming either. As far as Mother Nature goes - "Been there, done that."