I've said it before, and I'll say it again: I'm no climate scientist. When there's talk about "global warming" or "climate change," I politely decline to give a definitive statement because I have no idea who is speaking from solid data/principle and who is speaking from the wrong end of their digestive tract.
However, one thing I will say is that I don't think we should start spending billions of dollars trying to solve a problem that we don't really understand and might not even exist. Nothing involving the climate/ecosphere/Captain Planet is ever as simple as it might seem.
Case in point: This recent article from Science about the discovery of active volcanoes underneath the West Antarctic ice sheets. I've read about that ice sheet's regression as proof of anthropogenic global warming. Now it looks like some of that (How much? Good question.) may be due to a volcano. Unless someone is willing to blame the volcano on carbon emissions as well, I think it's safe to say that we might not understand what's at work there as much as we thought we did.
But what do I know? I'm no climatologist.