Lower temperatures = less melting = more ice = lower temperatures, on and on and until factors # 1 and # 2 rescue us from turning into a giant snowball (or, during the most extreme ice age,
a spate of volcanic eruptions eventually helped belch out enough carbon dioxide to warm the atmosphere and reset the thermostat.)
The end - Triassic extinction has been linked to
a spate of volcanic eruptions around the birth of the central Atlantic Ocean.
Not exact matches
What if the sun goes cool, or we have a
spate of major
volcanic eruptions: would we be able to isolate the contribution from the reduced CO2 emissions?
For one, a
spate of sky - darkening
volcanic eruptions that had triggered a period
of increased sea ice which reflected sunlight from the North Atlantic region.