stressed the gap between the sum of these which take us to 3.0 to 4.0° C & what is needed to avoid a maximum of a 1.5°C or 2.0°C
limit on global temperature rise saying, "to secure our future, we will have to do much better and we will have to be very proactive in doing that."
Here we present a proposal based on the contraction & convergence principle as proposed by the Global Commons Institute in the early 1990s. This principle describes a trajectory whereby the overall emission level is reduced over time whilst the per capita emissions rates of different countries converge on a low value aimed at meeting the 2°C objective. This allows developing countries to maintain some emissions growth in the intermediate phase, which is made up for by a decrease in developed country emissions. The overall amount emitted should not be more than will cumulatively push temperature increases over 2°C. In the global cap & trade system we propose here, emissions are traded based on a per capita allocation of CO2 trading permits at some future date. International climate change negotiations: Key lessons and next steps
Smith School of Enterprise and the Environment [SSEE] University of Oxford July 2011