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He kinda does...
http://newsvote.bbc.co.uk/1/hi/sci/tech/4664549.stm
While he still doesn't categorically state he believes, in the wake of G8 he acknowledges:
- climate change as a challenge (ie, that the climate is changing)
- greenhouse gasses as the problem; and
- people as the cause.
That's pretty damn close to believing...