 Nyorai kuenderera mberi kweiyi ndima - Izvi zvinoratidza kuti hapana kufambira mberi kubva muna 1992, apo United Nations Framework Convention on Climate Change yakagadzirwa paMusangano wePasimuRio de Janeiro. Chibvumirano cheCancun cha2010 chakanga chakaenzana nokushanda nezvakanga zvataurwa nechibvumirano cha1992: 