Most people don't realise this, but the majority of high-income nations have already significantly exceeded their fair share of the carbon budget for 2 degrees. Their "zero by 2050" targets are therefore woefully inadequate. 
This chart is based on emissions data from 1850 to 2015, with consumption-based emissions from 1970 onward.
In order to represent any modicum of fairness or justice, the objective in rich nations needs to be zero as soon as is technically feasible, including by scaling down energy demand so decarbonization can be done more quickly.
Rich nations' 2050 targets are tantamount to saying "We've already eaten more than our fair share of the pie, but will keep going for another 30 years, eating every one else's share too, putting all life at risk." Expecting the global South to go along with this is wild.
For those asking about methods, we used the same approach as in this paper, but with a budget for 2 degrees rather than for 350ppm. thelancet.com/journals/lanpl…
Ask yourself, given that high-income nations have already overshot their 2C carbon budgets, what should be the target date for decarbonization in line with the Paris Agreement?
Here's what you do: a) radically scale down energy use to enable decarbonization by 2025 or 2030; and b) make up the overshoot by paying reparations for climate debt to the global South.
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