Navroz K Dubash1, Marc Fleurbaey2, Sivan Kartha3. 1. Centre for Policy Research, New Delhi, DL 110021, India. IPCC WGIII Lead Author. 2. Princeton University, Princeton, NJ 08544, USA. IPCC WGIII Coordinating Lead Author. 3. Stockholm Environment Institute, Stockholm 10451, Sweden. IPCC WGIII Coordinating Lead Author.