The fourdegree world

1 See http://www.eci.ox.ac.uk/4degrees. Abstracts, PowerPoint presentations, audio and, in some cases, full papers from the conference can all be found on the site.

2 Although the global deep-ocean temperature was 4°C warmer than today 15 million years ago. See James Hansen et al., 'Target Atmospheric CO2: Where Should Humanity Aim?', The Open Atmospheric Science Journal, vol. 2, 2008, pp. 217-31, Figure 3b.

3 In the St James's Palace Memorandum of May 2009.

4 Clive Hamilton, 'The Commonwealth and Sea-Level Rise', The Roundtable, September 2003.

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