Carbon Reduction Policies: A Regional Comparison of Their Contributions to CO
2
Abatement in Six Carbon Trading Pilot Schemes in China
XIU Jin-Feng
1,
2
, CHOU Jie-Ming
1,
2,
*
, DONG Wen-Jie
1,
2
, YANG Zhi-Yong
1,
2
, DAI Ru-Feng
1,
2