What is the likelihood of us entering another Ice Age?

First of all, we just came out of an ice age 11,000 years ago when the sea levels were 400 feet lower worldwide than now which explains how Eskmos and native Americans made it over from Asia to Alaska, Canada and the U.S. and Mexico at some point. However, they could have sailed here too. This is another alternative to getting here too.

But, what comes before an ice age? Basically, the CO2 levels increase like now. Then rain comes a lot which blots out the sun. Then it starts snowing more because the ground is covered from clouds. Then eventually it starts snowing in the summers because of lack of sun hitting the ground the snow sticks more. 

So, basically (from some points of view) the end result of CO2 buildup could easily be another ice age even though it seems weird this also could happen from CO2 buildup. Of course the other alternative might be 600 degrees here on earth. So, basically it could go either way or something we aren't aware of at present. (because no one has experienced this yet).