Startribune.com just posted an article about the next ice age. In the article, Pravda claims we are on the verge of another ice age. This is true, I have no doubt. As the orbit of the earth changes, we will exit this interglacial warm period and we will again have a near snowball earth.
The key to keep in mind is time. Looking at this graph, from about 125,000 years ago to 115,000 years ago, global temperature did its steepest drop of about 6°C. That works out to 0.06°C per century. In comparison, global temperatures since 1900 have risen approximately 0.75 °C. So even if we are already in the steepest decline into an ice age, the short-term anthropogenic effects are going to win out. Especially if anthropogenic forcing gets stronger, as it is expected to do.
Something else to keep in mind. If a 6°C drop in temperature can create a near snowball earth, what are the effects of a 2-5°C rise in temperature? Probably nearly equal in devastation.