I took Palin's comment to mean something very different than what people on here seem to be saying. I heard her say that she didn't want to argue about the causes; nothing about how understanding the causes was unimportant, just that it wasn't a useful area to debate (although it's also possible that she simply hadn't been prepped for talking about causes of climate change).
She went on to talk about how important it was to prevent climate change by reducing emissions, which seems to me to be an admission that greenhouse gas emissions are responsible for climate change.
I think that most scientists would say that if we're in agreement that reducing greenhouse gas emissions is the way to minimize climate change, then there's no need to argue about causes, since they've already been implicitly agreed upon.
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