Allocating a 2°C cumulative carbon budget to countries (10 page pdf, Renaud Gignac and H Damon Matthews, Environ. Res. Lett., Jun. 19, 2015)
Today we review a very timely analysis and proposition concerning the equitable sharing of the carbon debt that needs to be paid off in order for the world to meet the objective of limiting climate warming to 2 deg C or 450 ppme by 2050 which is the objective of the climate conference to be held in Paris in December 2015. The authors estimated past CO2 emissions from the nations of the world, noting the top ten emitters were United States, China, Russia, Brazil, India, Germany, United Kingdom, France, Indonesia and Canada (where the roles of USA and Russia stand out). The turning to the carbon debt as a result of future emissions projected with climate modeling from now to 2050 (where the current peak emissions from the USA and China stand out). Commitments stated by some countries in advance of the conference fall well short of the combined carbon debt but the approach presents the benefit of an objective sharing of responsibility for reaching the target. Further refinement is needed to move beyond CO2 emissions to include other greenhouse gases.
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