That's 1 IAU within 100 years. Temperature increases keep going after that...there's lots of interia in the system just from simple things like the large specific heat of water in the oceans.
Note that the impact of CO2 concetration on warming is logarithmic. the key parameter is "climate sensitivity": how many degrees C warming you get per *doubling* in CO2 concentration.
Alt text: "The good news is that according to the latest IPCC report, if we enact aggressive emissions limits now, we could hold the warming to 2°C. That's only HALF an ice age unit, which is probably no big deal."