title: Correspondence: Reply to 'Reassessing the contribution of natural gas to US CO2 emission reductions since 2007'.
authors.affiliation: Department of Geographical Sciences, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Kuishuang
authors.initials: K
authors.lastname: Feng
authors.affiliation: Department of Earth System Science, University of California, Irvine, California 92697, USA.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Davis
authors.affiliation: Department of Geographical Sciences, University of Maryland, College Park, Maryland 20742, USA.|Department of Financial and Management Studies, SOAS, University of London, London WC1H 0XG, UK.|International Institute for Applied Systems Analysis (IIASA), Laxenburg A-2361, Austria.
authors.forename: Laixiang
authors.initials: L
authors.lastname: Sun
authors.affiliation: Department of Geographical Sciences, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Klaus
authors.initials: K
authors.lastname: Hubacek