1. School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou, China
2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, China
3. Key Laboratory of Coal Bed Gas Resources and Forming Process of Ministry of Education, China University of Mining and Technology, Xuzhou, China
4. Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, China
5. Department of Civil, Environmental and Sustainable Engineering, Santa Clara University, Santa Clara, CA, USA