Th clmt chng plcy f th ntd Stts hs mjr mpcts n glbl clmt chng nd glbl clmt chng mtgtn. Ths s bcs th ntd Stts s th scnd lrgst mttr f grnhs gsss n th wrld ftr Chn, nd s mng th cntrs wth th hghst grnhs gs mssns pr prsn n th wrld. Cmltvly, th ntd Stts hs mttd vr trlln mtrc tns f grnhs gss, mr thn ny cntry n th wrld.
Clmt chng plcy s dvlpd t th stt nd fdrl lvls f gvrnmnt. Th nvrnmntl Prtctn gncy (P) dfns clmt chng s "ny sgnfcnt chng n th msrs f clmt lstng fr n xtndd prd f tm." ssntlly, clmt chng nclds mjr chngs n tmprtr, prcpttn, r wnd pttrns, s wll s thr ffcts, tht ccr vr svrl dcds r lngr. Th plcy wth th bggst S nvstmnt n clmt chng mtgtn s th nfltn Rdctn ct f 2022.
Th pltcs f clmt chng hv plrzd crtn pltcl prts nd thr rgnztns. Th Dmcrtc Prty dvcts fr n xpnsn f clmt chng mtgtn plcs whrs th Rpblcn Prty tnds t dvct fr slwr chng, nctn, r rvrsl f xstng clmt chng mtgtn plcs. Mst lbbyng n clmt plcy n th ntd Stts s dn by crprtns tht r pblcly ppsd t rdcng crbn mssns.