A global issue requires an extremely holistic understanding and a carefully measured approach. We don't want unforeseen (or, well, even foreseen) secondary effects to kick us all in the ass.
We screw up, for example, national defense in that particular way all the time. If we can't even get that right, then we're not ready for any particular global solution to a global problem. Especially if such a problem isn't well-defined in the first place.
While all of that is happening behind the scenes, though, extremists are driving the picture that we see and discuss, and that's only the surface of the whole thing.
Thankfully, we're working diligently toward an understanding. But I also have a life to live. Those two things can happen in parallel.
Hoover puts the whole thing into perspective pretty well: http://www.hoover.org/sites/default/...matechange.pdf