I would start by burning more coal.
Actually, if this is going to happen:
1. It will be another 5000 years before we get to the point where it is really noticeable, and;
2. If it's gonna happen, it's gonna happen no matter what we do.
The idea that mankind can control the climate is ludicrous. In the cosmic scheme of things, we're just not that big a deal.
Mankind could conceivably control the climate, but it would take far more technology than we currently possess. I also agree with the author’s comment that mankind is “warming” the climate. That’s not the issue. The issue is whether or not man’s activities have a significant effect on climate relative to other factors like the sun. Like you wrote, we could burn a lot more coal to try and avoid another ice age, but I don’t think it would make a significant difference. That’s not to say there aren’t other techniques that could be used to mitigate the impact of an ice age.