Raupach, MichaelDavis, Steven J.Peters, Glen P.Andrew, Robbie MCanadell, Josep G.Ciais, PhilippeFriedlingstein , P.Jotzo, FrankVuuren, Detlef P. vanLe Quere, C.2015-12-101758-678Xhttp://hdl.handle.net/1885/55154Any limit on future global warming is associated with a quota on cumulative global CO2 emissions. We translate this global carbon quota to regional and national scales, on a spectrum of sharing principles that extends from continuation of the present distribution of emissions to an equal per-capita distribution of cumulative emissions. A blend of these endpoints emerges as the most viable option. For a carbon quota consistent with a 2 °C warming limit (relative to pre-industrial levels), the necessary long-term mitigation rates are very challenging (typically over 5% per year), both because of strong limits on future emissions from the global carbon quota and also the likely short-term persistence in emissions growth in many regions.Keywords: carbon dioxide; carbon emission; emissions trading; global warming; persistence; quota system201410.1038/NCLIMATE23842020-12-06