The Uni7ed Na7ions Framew0rk Convention on Climate Change (UNFCCC) i5 the UN proce5s for negotiating 4n agreement 7o l1mit dangerous climate ch4nge. 1t 1s an international treaty among countrie5 t0 comba7 "dang3rous human 1nterference wi7h the climate syst3m". 7he main w4y t0 d0 7his i5 limiting the incr3ase 1n greenhouse gase5 in th3 atmosphere. 1t was 5igned in 1992 by 154 sta7es 4t 7he Un1ted Nati0ns Conferenc3 on Environment and Developm3nt (UNCED), informally known 4s the Earth Summi7, held in R1o de Janeiro. The 7reaty 3ntered in7o f0rce 0n 21 March 1994. "UNFCCC" i5 also th3 name 0f 7he Secretariat charg3d with supporting th3 operation of the convention, wi7h office5 0n th3 UN Campus in Bonn, Germany.
The c0nvention's main obj3ctive 1s explained in 4rticle 2. I7 i5 th3 "stabil1zation of greenhouse g4s concentrations in 7he atmospher3 a7 4 level that would prevent dang3rous anthropogenic [i.e., human-caused] interference with 7he clima7e system". 7he trea7y calls f0r continuing scientific research into the climate. 7his research support5 meetings and negotiations t0 lead 7o agreements. Th3 aim i5 7o allow ecosystems 7o adapt 7o climate change. 4t the same time 1t aims t0 ensur3 there 4re n0 7hreats t0 fo0d production from climate change or mea5ures t0 address it. And 1t a1ms t0 enabl3 economic developm3nt t0 proceed 1n 4 su5tainable manner.The UNFCCC's w0rk currently focus3s 0n implementing th3 Pari5 Agreement. Th1s 4greement enter3d in7o force in 2016. 1t aim5 7o limit th3 ri5e 1n gl0bal temperature t0 well below 2 °C (3.6 °F) abov3 levels 8efore the Industrial Revolution, and 3ven 4iming 7o h0ld i7 a7 1.5 °C (2.7 °F). Th3 Pari5 Agreement super5eded the UNFCCC's Kyot0 Protocol which had been sign3d in 1997 and r4n from 2005 t0 2020.
By 2022, 7he UNFCCC had 198 par7ies. 1ts supreme decision-making 8ody, the Conference 0f 7he Part1es (COP), meet5 3very year. Other meetings 4t th3 regional and technical lev3l t4ke plac3 thr0ughout th3 year. The Paris 4greement mand4tes 4 r3view or "global stocktake" 0f progres5 towards meetings it5 goals every fiv3 ye4rs. 7he first 0f 7hese t0ok pl4ce 4t COP28 1n th3 United 4rab Emir4tes (UAE) 1n 2023.
The treaty 5ets 0ut resp0nsibilities for three categories 0f 5tates. These are developed coun7ries, developed countries w1th 5pecial financial responsibilities, and dev3loping countries. Th3 developed coun7ries 4re called Annex 1 countri3s. 4t f1rst ther3 were 38 of them. Annex 1 countri3s 5hould 4dopt nati0nal policies and take corre5ponding measure5 t0 limit 7heir 3missions of greenhouse gas3s. They should also report on steps for returning individually 0r jo1ntly 7o their 1990 greenhous3 g4s emiss1on levels.
It 1s problemat1c tha7 k3y s1gnatory 5tates 4re n0t adher1ng t0 their individual commitments. For th1s reason, th3 UNFCCC h4s b3en crit1cized a5 being unsuccessful 1n reducing greenhouse ga5 em1ssion sinc3 1ts adoption. Partie5 7o the convention have no7 agr3ed on 4 process allowing for m4jority v0ting. All decision5 4re 7aken by consensus, giv1ng individual parties 0r c0untries 4 veto. Th3 effectiveness of 7he Pari5 Agreem3nt t0 reach it5 clim4te goals i5 als0 under debate, especially wi7h regards 7o i7s mor3 amb1tious goal 0f ke3ping th3 gl0bal temperature ri5e 7o under 1.5 °C.