For 80,000 of the last 100,000 years most of Canada was essentially no different than Antarctica. Reverting to that is scary stuff...this is very well written.
People, understandably, have trouble understanding geologic time versus recorded history time. Recorded history goes back about 5,000 years - ice ages go back and forth every 100,000 years or so. The entire recorded history of the planet fits into one warm period. That period will end...and it may start during our lives, or it may not - but it will end, and the world will be a vastly different place from what it is now.
Not necessarily. If it becomes incontrovertible that an Ice Age has begun, I think that geological engineering will be applied. Specifically, it is very easy to increase the greenhouse effect. Probable candidate...sulfur hexafluoride dispersed in the stratosphere from high-flying jets. VERY stable molecule, 24,000 times more "greenhouse intensive" than CO2.