'Towards a Global Green Recovery', produced on behalf of the German Foreign Office, was written by Ottmar Edenhofer, co-chair of the Intergovernmental Panel on Climate Change, and Nicholas Stern, chair of the Grantham Research Institute on Climate Change and the Environment at the London School of Economics and Political Science, UK. Stern's message for G20 summit is clearly that stimulus packages must focus more resources on clean energy and averting climate change. Nature.com news reports here and has link to report document.