that is a good question my friend. i have a teacher (she is a micro biologist, molecular biologist, and happens to be a pretty damn good geologist as well) who believes we are slipping into another ice age. However, because of global warming, we arent following normal seasonal changes when entering the intermediary ice age peroiods. basicly our summers are getting hotter and longer (due to global warming) and our winters fiercer (becase of ice age) but since the summers are warmer and longer the transition into our nasty winters (which have been seen throughout the northern parts of north america)will become more and more abrupt. her theorey is that eventualy global warming will only slow this process but in the end we will slip into a sort of "global winter".