In general trees act as "scrubbers" when they're growing. When they're all already grown they don't absorb as much CO2, at least to my knowledge.
But the fact that there are always things growing in the rain forest belies that claim. Anyways, bulldozing a tree eliminates any CO2 absorbing it was doing, and then it decomposes, releasing CO2.
Why Republicans have such a stick up their ass about conservation being the first "green" source of "energy" we have is mind boggling. The thought of frugality hurts them, somehow. Also if we could just improve our infrastructure, high capacity renewable energy sources like the southwest desert for solar and the midwest plains for wind could power much larger swaths of our country, not just the surrounding area. Lastly, if we could only manage to create a storage medium for energy that is better than the battery designed hundreds of years ago, we'd be in a much better place when it cames to renewable energy.