I live in the DC metro area, and we've had a colder than average year this year and haven't had more than a few inches of snow *total* all winter for a few years now... Not only that, but global warming should be increasing the total amount of arable land, and each historical warming period (yes, there have been ones before, and yes, more severe) have all resulted in highly productive periods for the human civilizations who existed at the time.
Ice ages are the problem, really. Ice ages are MUCH harder to cope with for living organisms - just ask the Neanderthals. Where I live here in Maryland was underneath a mile or two of ice during the last ice age (which carved out the lovely Cheasapeake Bay during the glacial retreat when that ice age came to a close). Huge ice sheets are a hell of a lot harder to handle than more arable land and more rainforests...
I fully support global warming and will be doing my best to contribute to it! I pledge to increase my carbon footprint each year, to the best of my ability. This, I promise.
Gotta do my part!