Similarly, a colder
climate with generally decreased humidity q O could be closer to the critical threshold, which might be the reason for less -
stable monsoon circulations during
glacial periods.
If it turned out that rapid
climate change events are caused by comets, it would imply the
climate system is far more
stable than we thought, that abrupt
climate change events are not part of the inherent variability of
climate during
glacial periods.