1. School of Environment; Tsinghua University; Beijing 100084 PR China
2. Department of Chemical Engineering; Imperial College London; London SW7 2AZ UK
3. Institute for Sustainable Futures; University of Technology Sydney; Sydney 2007 NSW Australia
4. Sandia National Laboratories; Livermore CA 94551 USA
5. Climate Change Cluster; University of Technology Sydney; Sydney 2007 NSW Australia
6. Institute of Ocean Science and Technology; Graduate School at Shenzhen; Tsinghua University; Shenzhen PR China
7. School of Chemical & Biomolecular Engineering; The University of Sydney; Sydney NSW 2006 Australia
8. Current address: Joint Bioenergy Institute; 5885 Hollis St Emeryville CA 94608 USA
9. Key Laboratory for Solid Waste Management and Environmental Safety; Ministry of Education; Beijing 100084 PR China