The simple fact is this:
A drastic warming OR a drastic cooling would have monumental, cataclysmic effects on man.
But between the two, cooling would be far, far more disastrous. A twelve month period of cooling could kill five billion people.
Man cannot make it happen or stop it from happening.
True and its a fact that we are in an interglacial warm period that has lasted over 11k years. Interglacial periods average 10k years and are followed by glacial(iceage) periods that average 100k years. We are overdue for an iceage. It is ironic and entirely possible that when we start to enter the coming iceage we will respond to it by PUMPING as much CO2 into the atomosphere as we can.