Apollo-Gaia Project

Director: David Wasdell

Response to

Deep Decarbonization PathWays

Project Report

The full report is available at


It can also be downloaded from: http://unsdsn.org/wp-content/uploads/2014/07/DDPP_interim_2014_report.pdf
This responsive commentary is grounded in the recently published presentation "Sensitivity and the Carbon Budget" which is the culmination of nine years of intensive systems dynamics analysis carried out under the aegis of the Apollo-Gaia Project. That publication brings together two streams of work. The first is the analysis of "Sensitivity, Non-Linearity and Self-Amplification in the Global Climate System" presented to the Club of Rome as the conference keynote address at their annual gathering in September 2013. The second is the "Basis for a Carbon Budget? A Critical Evaluation of the Summary for Policymakers of the IPCC AR5 WG1" released in February 2014. The Commentary and its underlying analyses are offered to the UNSDSN as a strategic resource ahead of the Global Leaders meeting convened this coming September in New York under the aegis of the United Nations. The new analysis has profound and potentially transformative implications for the whole strategic process of our international commitment to avoid dangerous climate change.
In its preface, The Deep Decarbonization Pathways Project (DDPP) states it is a collaborative initiative to understand and show how individual countries can transition to a low-carbon economy and how the world can meet the internationally agreed target of limiting the increase in global mean surface temperature to less than 2 degrees Celsius.
However deep the decarbonization pathway is driven (and it would have to achieve zero contribution to forcing from all sources), the task of stabilizing GHG concentrations at a level that prevents dangerous anthropogenic interference with the climate can no longer be achieved by a strategy that is restricted to emissions reduction on its own, as is suggested by the Deep Decarbonization Report.