Obviously most scientist agree that the earth is at least ending its icey/temporate period and is heating up. Weather or not people have contributed to it or not I think is an endless debate that cannot be answered right now. I will say that I think both sides of the argument can agree humanity as a whole has done little to prevent global warming thus far.

A possible solution to the heating is to increase the Earth's albedo. For those that don't know albedo is a planet's reflectivity of solar radition. High albedo means the planet reflects lots of solar radition and is usually cooler than planets with low albedo. Inversly low albedo means more radiation is absorbed and such a planet is generally warmer.

So the question is can we increase Earth's abledo enough to stabilize the green house effect? Albedo is increase by matterials like ice and sand and decreased by flowing water or dark surfaces. Assuming there is no limmit for budget, maybe there is a way that the global community can find a solution and create matterials that reflect solar radiation. Its apperant that if we continue to increase CO2 emmissions and the earth continues to release gasses on its own that we'd have to keep adding more and more of whatever solution. But in theory if we can control the average temp for a few centuries the Earth may re-enter is cold period before causing irreprable damage.

Then we'd just have to worry about causing a "nuclear winter" type affect.