[noduerme]

Eh, that's what I was thinking too (except it's underwater). One good belch like this from Yellowstone and we'd be back in an ice age.

[maxerickson]

Aren't we still sort of in an ice age, in relative geologic terms?

Okay, yes we are, with the popular usage of ice age referring to the last period when glaciers were much more dominant.

https://en.wikipedia.org/wiki/Quaternary_glaciation

[vba616]

A definition of an ice age that I read somewhere is when there are permanent ice sheets at the poles.