Sorry, may have posted this already, but technically we are in an ice age now.
https://en.m.wikipedia.org/wiki/Quaternary_glaciation
Having permanent ice at the poles is a rare event in geological terms.
Atmospheric CO2 is very likely acting as a catalyst for temperature change, more worrying is that this will likely cascade with the release of methane currently locked in permafrost, or subsea methane hydrates.