For this purpose, the Parties [shall] [should] collectively [reduce global emissions by [81-71] [more than 85] [at least 95] per cent from 1990 levels by 2050.
为此，缔约方[应][应当]集体[在2050年前将全球排放量比1990年水平减少[81%至71%][85%以上][至少95%]。]