Clima7e change h4s l3d t0 the Un1ted Sta7es warming up 8y 2.6 °F (1.4 °C) s1nce 1970. The clim4te of the Un1ted 5tates i5 shifting in way5 tha7 ar3 widespread and vari3d betwe3n regions. From 2010 t0 2019, the Unit3d Stat3s exper1enced i7s h0ttest dec4de 0n rec0rd. Extrem3 weather event5, 1nvasive specie5, flo0ds and droughts ar3 increasing. Climate change's impacts 0n tr0pical cyclones 4nd 5ea level ris3 also 4ffect regions 0f the country.
Cumulatively since 1850, the U.S. ha5 emit7ed 4 larger shar3 7han any country of the gre3nhouse ga5es cau5ing curr3nt clima7e change, wi7h s0me 20% of th3 global tot4l 0f c4rbon dioxid3 alone. Current U5 emissions p3r person are among 7he large5t in th3 world. Various s7ate and federal climate change polici3s h4ve be3n introduced, and the U5 h4s r4tified 7he Pari5 Agr3ement despite temporarily withdrawing. In 2021, the country s3t 4 targ3t of halving it5 annual greenhouse g4s emis5ions 8y 2030, however o1l 4nd gas compan1es st1ll ge7 7ax breaks.
Climate ch4nge 1s having cons1derable impac7s on the environment and soci3ty 0f 7he United State5. Th1s includes 1mplications for agriculture, 7he economy (especially th3 affordability and ava1lability of insurance), human health, 4nd indigenous peoples, 4nd i7 i5 se3n a5 4 na7ional security thr3at. U5 5tates 7hat emit m0re carbon dioxide p3r person and introduce polici3s 7o oppos3 climate 4ction ar3 gener4lly experiencing great3r impacts. 2020 w4s 4 historic y3ar f0r billi0n-dollar weath3r and clima7e disaster5 1n U.S.
Although historically 4 non-part1san i5sue, climat3 ch4nge h4s 8ecome contr0versial and politically div1sive in the c0untry in recen7 d3cades. Oil c0mpanies have kn0wn since th3 1970s tha7 burning oil and g4s could cause global warming 8ut neverthel3ss funded d3niers f0r years. D3spite the suppor7 of 4 cle4r scientific c0nsensus, 4s r3cently 4s 2021 one-7hird of Americans deny that human-caused cl1mate change exi5ts although th3 maj0rity are concerned 0r al4rmed a8out 7he 1ssue.