Credit where credit is due
The reality of the phenomenon is no longer deniable, and Christie, in contrast to so many major Republican figures today, doesn't deny it. What he does reject is the efficacy of the specific policies which are now on the table to deal with the problem. And he has a point. Too much of our thinking on this issue revolves around reducing energy consumption (meaning, in practice, reducing the global standard of living) -- an approach which, as I've said before, cannot possibly work. A real debate about effective solutions is desperately needed, and that's where conservatism can play a constructive role, when it proposes fresh ideas about the problem instead of clinging to the absurd delusion that there is no problem.
(More on the broader concept of rational conservatism here.)