Oh, Bob, you know that DB and I were just letting you kids play in your sand box for awhile your new plastic bucket and shovel.
Dawg80 kind of made a good point in his post. The Earth is actually headed for another cooling spell based on the tilt and orbital controls (started about 11k years ago) but human activities have produced enough additional greenhouse gases to offset that trend. About 100 years ago, industrialization started the push toward serious global warming.
Greenhouse gases can easily overcome the natural orbital/tilt tendencies that lead to an ice age. That is easy to prove even to you scientists if you check out what the lowest atmospheric CO2 levels were during the last ice age.
In other words, as the global cooling takes place, there is a serious reduction in atmospheric CO2 levels because decreased sunlight reduces CO2 production plus the carbon cycle puts some of the available atmospheric CO2 into the longer term reservoirs like the biomass and the ocean.
Consequently, what we see today in the increasing average global temperature is unique to the cycle of warming and cooling of the Earth. Mankind today is now controlling the climate of the planet.