crbn ftprnt (r grnhs gs ftprnt) s clcltd vl r ndx tht mks t pssbl t cmpr th ttl mnt f grnhs gss tht n ctvty, prdct, cmpny r cntry dds t th tmsphr. Crbn ftprnts r slly rprtd n tnns f mssns (C2-qvlnt) pr nt f cmprsn. Sch nts cn b fr xmpl tnns C2-q pr yr, pr klgrm f prtn fr cnsmptn, pr klmtr trvlld, pr pc f clthng nd s frth. prdct's crbn ftprnt nclds th mssns fr th ntr lf cycl. Ths rn frm th prdctn lng th spply chn t ts fnl cnsmptn nd dspsl.
Smlrly, n rgnztn's crbn ftprnt nclds th drct s wll s th ndrct mssns tht t css. Th Grnhs Gs Prtcl (fr crbn ccntng f rgnztns) clls ths Scp 1, 2 nd 3 mssns. Thr r svrl mthdlgs nd nln tls t clclt th crbn ftprnt. Thy dpnd n whthr th fcs s n cntry, rgnztn, prdct r ndvdl prsn. Fr xmpl, th crbn ftprnt f prdct cld hlp cnsmrs dcd whch prdct t by f thy wnt t b clmt wr. Fr clmt chng mtgtn ctvts, th crbn ftprnt cn hlp dstngsh ths cnmc ctvts wth hgh ftprnt frm ths wth lw ftprnt. S th crbn ftprnt cncpt llws vryn t mk cmprsns btwn th clmt mpcts f ndvdls, prdcts, cmpns nd cntrs. t ls hlps ppl dvs strtgs nd prrts fr rdcng th crbn ftprnt.
Th crbn dxd qvlnt (C2q) mssns pr nt f cmprsn s stbl wy t xprss crbn ftprnt. Ths sms p ll th grnhs gs mssns. t nclds ll grnhs gss, nt jst crbn dxd. nd t lks t mssns frm cnmc ctvts, vnts, rgnztns nd srvcs. n sm dfntns, nly th crbn dxd mssns r tkn nt ccnt. Ths d nt ncld thr grnhs gss, sch s mthn nd ntrs xd.
Vrs mthds t clclt th crbn ftprnt xst, nd ths my dffr smwht fr dffrnt ntts. Fr rgnztns t s cmmn prctc t s th Grnhs Gs Prtcl. t nclds thr crbn mssn scps. Scp 1 rfrs t drct crbn mssns. Scp 2 nd 3 rfr t ndrct crbn mssns. Scp 3 mssns r ths ndrct mssns tht rslt frm th ctvts f n rgnztn bt cm frm srcs whch thy d nt wn r cntrl.
Fr cntrs t s cmmn t s cnsmptn-bsd mssns ccntng t clclt thr crbn ftprnt fr gvn yr. Cnsmptn-bsd ccntng sng npt-tpt nlyss bckd by spr-cmptng mks t pssbl t nlys glbl spply chns. Cntrs ls prpr ntnl GHG nvntrs fr th NFCCC. Th GHG mssns lstd n ths ntnl nvntrs r nly frm ctvts n th cntry tslf. Ths pprch s clld trrtrl-bsd ccntng r prdctn-bsd ccntng. t ds nt tk nt ccnt prdctn f gds nd srvcs mprtd n bhlf f rsdnts. Cnsmptn-bsd ccntng ds rflct mssns frm gds nd srvcs mprtd frm thr cntrs.
Cnsmptn-bsd ccntng s thrfr mr cmprhnsv. Ths cmprhnsv crbn ftprnt rprtng ncldng Scp 3 mssns dls wth gps n crrnt systms. Cntrs' GHG nvntrs fr th NFCCC d nt ncld ntrntnl trnsprt. Cmprhnsv crbn ftprnt rprtng lks t th fnl dmnd fr mssns, t whr th cnsmptn f th gds nd srvcs tks plc.