Hmmmmm, interesting. All of that stuff combined could have some effect. But if we had a major ice age similar to the one that sent glaciers all the way into present-day America and carved out the Great Lakes, somehow I think our efforts would be overwhelmed by the lack of solar energy reaching earth. But it all depends on how big the greenhouse effect really is from CFC's, CO2, etc. We're still building our knowledge of the greenhouse effect and nobody knows for sure whether these gases really generate a greenhouse effect and how strong that effect is.
I can tell ya this.
The amount of energy currently coming to the earth from the sun is so much bigger than anything we can generate...and the energy that will be lost when the earth transitions to an oval orbital pattern (due to Milankovitch Forcing) will be so large that we would LOVE to have greenhouse gasses to keep some heat in...
The plain fact is, the earth is REALLY REALLY big, and we are REALLY REALLY small and we cannot really affect things on the scale that Al Gore imagines.