Africa is the continent which contributes least to global emissians of greenhouse gases-yet is thernmost vulnerable to its effects of reducing agricultural production, food security, increasedrnflooding and drought, widespread diseases, availability of water, and conflict over scarce landrnand water resources. The fact that Africa is regarded as one of the most vulnerable continents inrnterms of climate change means that Africa needs to take some initiatives to combat the adversernimpacts af climate change. The continent's particular vulnerability will be exacerbated unlessrnurgent action is taken. This thesis is conducted to identify the actual and potential impacts ofrnclimate change in Africa, international climate change negatiations and how and to what extentrnthese international negotiatians have been protecting the interests of Africa. Specifically, thernthesis aims. to identify the rales and responses of the African Unian and sub-regionalrnintergovernmental organizations in combating climate change. To gather the needed data,rnexploratory method'of research is used to explore international climate change regimes, climaternchange regimes of the African Union and sub-regional intergovernmental organizations,rndecisions and declarations of the African Union, programs and projects implemented by thernAfrican Union, sub- regional intergovernmentol organizations and individual African states. Thernresults showed that the African Union, as a pan African institution, responds to avert therncatastrophes of climate change by enacting its own climate change regimes, acceding to thernUNFCCC and Kyoto Protocol, developing its common position to climate change. The AfricanrnUnion also responds to climate change in partnership with various multilateral and bilateralrnorganizations. On the other hand, sub- regional intergovernmental organizations also playa keyrnrole in combating climate change. However, the responses of the African Union and sub-regionol intergovernmental organizations is mainly hampered by member states' conflictingrnneeds and interests, lack of clear relationship between the African Union and sub- regionalrnintergovernmental organizations, regional power house and the existence of various policy gapsrnat the national and sub- regional levels. So, sub- regional intergovernmental organizatians andrnindividual African states should harmonize interests and needs with that of the African Union.rnAfrican governments should integrate climate change issues into economic planning andrnmanagement at both national levels and should enhance coordination among them. Measuresrnshould also be taken to link the continent's common position and the prevailing regional, subregionalrnand national policies, strategies, practices and programs. African states should alsorncombat corruption; enhance accountability and transparency to use the climate financing fundsrnfor the purposes they are meant for. In addition, African governments have to establish andrnsustain credible institutions ta address climate change issues on the continent.rnKey words: climote chonge, internotionol climate chonge negotiations, African Union, subregionalrnintergovernmental organizations