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as a stabilization of GHG concentrations in the atmosphere at [400] [450 or lower] [not more than 450] [450] [least 450] ppm carbon dioxide equivalent (CO₂ eq) and a temperature increase limited to 2 ^oC or below above the pre-industrial level [with a probability greater than 50 per cent]. For this purpose, the Parties should collectively reduce global emissions by at least [50] [81–-71] [85] per cent [from 1990] levels by 2050.

as a stabilization of GHG concentrations in the atmosphere well below 350 ppm CO₂ eq and a temperature increase limited to below 1.5 ^oC above the pre-industrial level. For this purpose, the Parties should collectively reduce global emissions by [81-–71] [more than 85] [at least 95] per cent from 1990 levels by 2050.

as a global temperature increase limited to 2 ^oC above the pre-industrial level.

as a reduction in global average GHG emissions per capita to about 2 t CO₂.

as a statistically robust ceiling for the average global temperature increase strictly attributable to anthropogenic interference having a global effect, of [x] degrees Centigrade above mid-19th century levels, with per capita accumulative emission convergence between all Parties

on the basis of

Option 6.1

historical responsibility and capacity and national circumstances.

Option 6.2

emissions debt.

Option 6.3

an equitable allocation of the global atmospheric resources.

Option 6.4

economic and technological feasibility.