> I don't buy into the argument that if those people limited their travel and consumption then all of the sudden the non-believers will start believing.

Maybe it would convince folks, maybe it wouldn't, but you'd have a chance. By contrast, any effort that involves "Do as I say, not as I do", is pretty much guaranteed to fail, and rightfully so. Trying to force others to do something that you yourself are unwilling to do voluntarily is the exact opposite of leadership.