Researchers from Institute of Geology and Geophysics and other institutions have recently presented quantitative data for some critical issues in international negotiations on the control of atmospheric CO₂ concentrations. They demonstrate that a system rooted in “cumulative emissions per capita” is the best conception of the “common but differentiated responsibilities” principle according to fundamental standards of fairness and justice, and that the calculated emissions allowances under this system should be a foundation of an international system of responsibility to control atmospheric CO₂ concentrations. Based on this work, most developed countries had already used up their 2050 emissions allowances. Even if these countries could achieve their ambitious emissions reduction targets in the future, their emissions deficits would remain high. China’s projected total emission is 126.97 GtC over the period 2006-2050, proximate to its emissions allowance. Thus China may pursue a more flexible policy in international negotiations on climate change.

Comparison of emissions between major developed and developing countries