The way one frames it inevitably biases the resulting opinion.
If you think in terms of net change relative to a given level of emissions at some year... eu bad, US badder, China & India Terrible.
If you think in terms of "every person is entitled to X emissions per year," where X is current or desired average emissions (inc 0-emissions) then... China & India are best, EU & US are bad.
The more nationalistically we think of these things, the more nationalistic they seem and become.
If you think in terms of net change relative to a given level of emissions at some year... eu bad, US badder, China & India Terrible.
If you think in terms of "every person is entitled to X emissions per year," where X is current or desired average emissions (inc 0-emissions) then... China & India are best, EU & US are bad.
The more nationalistically we think of these things, the more nationalistic they seem and become.