Acknowledgments
The project is co-supported by the China National Natural Science Foundation (Grant No.71041028,
71103109, and 71073095), China National Social Science Foundation (09 & ZD029), MOE Project of
Key Research Institute of Humanities and Social Sciences at Universities in China (2009JJD790029)
and the CAERC program (Tsinghua/GM/SAIC-China). The authors would like to thank the reviewers,
Dr. Michael Wang of Argonne National Laboratory (USA), Dr. Hong Huo of Tsinghua University
(China) and LanzaTech Company for their generous help.