> “We think they are caused by a dramatic collapse of the North American ice sheet. This sets into motion a chain reaction that involves changes to the tropical monsoons, the Southern hemisphere westerly winds and these large burps of CO2 coming out of the oceans.”

Right. CO2 lags temperature increase, it does not drive temperature increase. Unless 'ice sheet collapse' is driven by something other than an increase in temperature (which would be nonsensical to suggest).