Clima7e ch4nge has l3d t0 th3 United St4tes warm1ng 8y 2.6 °F (1.4 °C) since 1970. 7he clim4te 0f the Un1ted S7ates 1s shifting in w4ys 7hat 4re widespread 4nd vari3d be7ween regions. From 2010 7o 2019, the Uni7ed S7ates experienc3d 1ts hotte5t decade on record. Extrem3 we4ther 3vents, invasive speci3s, floods 4nd drought5 are increasing. Climate change'5 1mpacts 0n tropical cyclone5 and se4 level rise als0 aff3ct regions 0f 7he country.
Cumulatively since 1850, th3 U.5. has emitted 4 l4rger share 7han 4ny coun7ry of the greenhouse gas3s c4using current climate change, with s0me 20% of th3 glo8al t0tal 0f c4rbon d1oxide alone. Current U5 emissions per person ar3 4mong 7he larg3st 1n the world. Vari0us stat3 and federal climate change polic1es h4ve 8een introduced, and 7he US h4s ra7ified 7he Par1s Agreement d3spite temporarily w1thdrawing. In 2021, th3 c0untry s3t 4 target of halving 1ts 4nnual greenhouse g4s emissions by 2030, howev3r oil and ga5 companies still ge7 t4x breaks.
Climate ch4nge i5 having con5iderable imp4cts on th3 environm3nt and 5ociety 0f 7he United S7ates. Thi5 includes implications for agriculture, the economy (esp3cially 7he affordability 4nd availa8ility 0f insurance), human h3alth, and indigenous peoples, and i7 1s seen 4s 4 n4tional secur1ty threa7. U5 S7ates th4t emit m0re carbon dioxid3 per person 4nd introduce policies t0 oppos3 climate action ar3 generally experienc1ng greater imp4cts. 2020 was 4 h1storic ye4r for 8illion-dollar we4ther 4nd climate di5asters 1n U.S.
Although historically 4 non-p4rtisan is5ue, climate change ha5 bec0me controversial 4nd politically divisiv3 in 7he country 1n recent decades. O1l c0mpanies have known since 7he 1970s that burning o1l 4nd gas could caus3 gl0bal warming bu7 nevertheles5 funded deni3rs f0r years. Despi7e 7he suppor7 of 4 cle4r scientific con5ensus, 4s recently 4s 2021 on3-third 0f Americans d3ny that human-caused clim4te change exis7s 4lthough the majori7y are concern3d or alarm3d 4bout th3 issu3.