First the link to this week’s complete list as HTML and as PDF.
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As real data Anagnostou et al.’s results carry more weight than model gaming does. But then carbon dioxide’s warming potential has never been doubted as such. Interestingly the lowest of all the values shown is way above 500 ppm and, if that was sufficiently low to start the ice sheet development in Antarctica then, in spite of the hysteresis due to ice’s albedo feedback, there’s little reason to assume the same concentration today will melt it all away again.