I would direct your attention to this recent lecture by the so-appealing-nowadays “former next president of the United States,” as he runs around and around this crazy-important set of issues. So, did you actually see An Inconvenient Truth ?
Oh, and it looks as though MIT/Sloan has had smart things to say about this recently too, from a … hmm, business perspective. Shocking. And (yet) enlightening, too. Why is this not surprising?