Template:Barreeffamoota sirreessuu barbaaddan thumb|280px|right|Global mean surface temperature anomaly 1850 to 2020
Ho'a Addunyaa (global warming) kan jedhamu itti darama adeemuu avreejiii tempireechara qilleensa lafatti dhi'aatee argamuu fi bishaan kan waggaa kudhanan kan duraa keessatti adeemsifamee fi kan itti fufa adeemuudha.
Avreejii tempireechariin qilleensa addunyaa lafatti dhi'aatee argamu waggaa dhibba bara 2005 dura jirutti hanga 0.74 ± 0.18 °C (1.33 ± 0.32 °F) guddate turee. Waldaan Intergovernmental Panel on Climate Change (IPCC) kan jedhamu akka waliigalanit "guddachuun avreg temprechera jiddu cencherii 20ffat ademsifame kan ka'ee sababa bayyina gazii greenhousii anthropogenic kan greenhouse effect kessan dhufuun". Ademsifami dhalotaan ta'u kan akka Jijjirama Aduu (Solar Variation) Volcano wajiin walit qabatee bara Industrii-duraa hanga 1950ffat ho'a qillensaf sababa yoo ta'uu, bara 1950 hanga amma immo qabana'u qillensaf sababa ta'a jedhame yadatama.
Waliigalteen guddan kun These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. While individual scientists have voiced disagreement with some findings of the IPCC,the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions. Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the 21st century. The range of values results from the use of differing scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a thousand years even if greenhouse gas levels are stabilized. The delay in reaching equilibrium is a result of the large heat capacity of the oceans.
Increasing global temperature will cause sea level to rise, and is expected to increase the intensity of extreme weather events and to change the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, trade routes, glacier retreat, species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.