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Former supporters of Powell still haven't gotten over what happened 2 years ago with his previous book, the one that he was actively promoting out of state while he told his loyal groupies that he was out there "fundraising" (a factual statement when you think about it, in the disambiguous sense).
It’s a disambiguous statement either way, and since we do not know the history of which product came first, we have no way of making a definitive case of one over the other.
If you’re making a point about AGW causing increases in precipitation, then it would help to point to a disambiguous quote.