I don't think we're heading for an Ice Age. We may be heading into a cooling trend. As I said up-thread, cooling would be bad: shortened growing seasons, more crop-damaging freezes, etc. If the price of food goes up significantly, many people in the Third World who are living on the edge will fall off the edge -- starvation, malnutrition, unable to afford decent housing or medical care because they have to spend all they have on food, etc.
The Third World will not starve quietly. They will want to come into First World countries and leach off their welfare systems, driving them into collapse. Read Camp of the Saints
If one looks at the past history of climate change, the short warm periods between the ice ages have been about 10,000 years or less. We are at about 12,000 years. Of course no one can predict the future on such things, but it would not surprise me to see a repeat of what has been going on for the last 400,000 years.
The first chart at the link shows what I’m talking about.
http://climatechange.thinkaboutit.eu/think4/post/the_co2_ability_to_time_travel