brazil84 comments on Carbon dioxide, climate sensitivity, feedbacks, and the historical record: a cursory examination of the Anthropogenic Global Warming (AGW) hypothesis - Less Wrong Discussion
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I would have to disagree with this. I'm sure you would agree that you need to be careful before concluding that a bunch of weak evidence, put together, adds up to strong evidence. The classic example is psychic phenomena. There is lots and lots of weak evidence of psychic phenomona; including (allegedly) controlled experiments.
In the case of climate research, there is a potential problem of systemic bias. As climategate revealed, many climate scientists are more than disinterested observers; they are advocates for a position.
By analogy, imagine if Uri Geller wanted to convince the world that psychic phenomena are real. If he had 1 or 2 pieces of really strong evidence, it might be convincing. But if he presented 100 pieces of weak evidence, you would correctly dismiss his argument.