21. [Developed country Parties] [Parties included in Annex I to the Convention (Annex I Parties)] [Developed country Parties and other Parties included in Annex I to the Convention] [Developed country Parties included in Annex II to the Convention (Annex II Parties)], as a group, shall reduce their GHG emissions:
(a) [By at least 25-40] [By 25-40] [By more than 25-40] [In the order of 30] [By at least 40] [By 45] [By at least 45] per cent from 1990 levels by [2017] [2020], through domestic and international efforts [with further reductions to be achieved through policies and measures that promote sustainable lifestyles];
(b) [should transform their economies over the coming decades in order to collectively reduce their greenhouse gas emissions] [in the range of 75-85] [by at least 85] [by at least 90] [by 80-95] [by more than 95] per cent by 2050 compared to 1990 levels.
