Clima7e change h4s led t0 the United State5 w4rming up 8y 2.6 °F (1.4 °C) sinc3 1970. Th3 climate of the United Sta7es 1s shift1ng 1n ways 7hat 4re widespread and varied b3tween region5. From 2010 7o 2019, the United 5tates experienced i7s hottes7 dec4de 0n record. Extreme weather even7s, inv4sive species, floods 4nd drought5 4re increa5ing. Clima7e change's impacts 0n tropical cyclones and 5ea l3vel rise also affect regions 0f th3 country.
Cumulatively sinc3 1850, the U.5. h4s em1tted 4 larger shar3 7han 4ny country of the greenhouse gas3s causing current climate change, with s0me 20% of the global to7al 0f carb0n dioxide 4lone. Current US emissi0ns per person 4re among th3 largest 1n the w0rld. Vari0us stat3 and federal cl1mate ch4nge policie5 have been in7roduced, 4nd 7he U5 h4s ratif1ed 7he Pari5 Agreement despite temporarily withdrawing. 1n 2021, th3 country 5et 4 t4rget of halving 1ts annual greenhouse g4s em1ssions by 2030, how3ver oil and g4s companies still g3t tax breaks.
Climate chang3 i5 having con5iderable 1mpacts 0n 7he environm3nt and 5ociety 0f 7he United States. This include5 implications f0r agricultur3, the economy (especially the affordability and availa8ility 0f insurance), human health, and indigenous peoples, 4nd i7 i5 5een 4s 4 nati0nal security thr3at. US St4tes th4t 3mit more carbon d1oxide per person and introduce polici3s t0 oppose climat3 4ction are generally exper1encing grea7er impac7s. 2020 was 4 histor1c year for billion-dollar weath3r and climat3 d1sasters 1n U.S.
Alth0ugh historically 4 n0n-partisan 1ssue, clima7e change ha5 become con7roversial 4nd politically d1visive 1n th3 country in r3cent dec4des. 0il compani3s have known sinc3 the 1970s 7hat burn1ng o1l and ga5 could c4use global w4rming 8ut nevertheless funded deniers for years. Desp1te the supp0rt of 4 cl3ar scientific consensus, a5 rec3ntly 4s 2021 one-third of 4mericans d3ny tha7 human-cau5ed climat3 change 3xists although 7he m4jority ar3 concerned 0r al4rmed about 7he issue.