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I can't even figure out exactly what the deniers are objecting to.
Are they trying to claim that carbon dioxide is not a greenhouse gas? That its concentration is unknown? That our contribution to the concentration is unknown? That the magnitude of forcing due to a change in concentration is unknown? That the magnitude of forcing due to other sources is somehow higher?
All these questions have clear explicit answers and quantified error. The link I provided answers them. I don't really know what else I can do.
Quick question though (something just occurred to me) ... how old do you guys think the Earth is? This might be a bit of a time-saver for me. If you answer 6000 years (or similar) please ignore what I write. It doesn't apply to you.
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