Making or breaking climate targets: The AMPERE study on staged accession scenarios for climate policy

This study explores scenarios of staged accession from the current situation of regionally
fragmented and moderate climate action to a global climate policy regime. The analysis is
based on scenarios in which a front runner coalition ? the EU or the EU and China ? embarks on
immediate ambitious climate action while the rest of the world makes a transition to a global
climate regime between 2030 and 2050. We assume that the ensuing regime involves strong
mitigation efforts but does not require late joiners to compensate for their initially higher
emissions. Thus, climate targets are relaxed, and although staged accession can achieve
significant reductions of global warming, the resulting climate outcome is unlikely to be
consistent with a 2 degree target. The addition of China to the front runner coalition can reduce
pre-2050 excess emissions by 20?30%, increasing the likelihood of staying below 2 degrees.
Not accounting for potential co-benefits, the cost of front runner action is found to be lower for
the EU than for China. Regions that delay their accession to the climate regime face a trade-off
between reduced short term costs and higher transitional requirements due to larger carbon
lock-ins and more rapidly increasing carbon prices during the accession period.

Authors:

KRIEGLER Elmar, RIAHI Keywan, BAUER Nico, SCHWANITZ Valeria Jana, PETERMANN Nils, BOSETTI Valentina, MARCUCCI Adriana, OTTO Sander, PAROUSSOS Leonidas, RAO Shilpa, ARROYO CURRAS Tabare, ASHINA Shuichi, BOLLEN Johannes, EOM Jiyong, HAMDI-CHERIF Meriem, LONGDEN Thomas, KITOUS Alban Gabriel, MEJEAN Aurelie, SANO Fuminori, SCHAEFFER Michiel, WADA Kenichi, CAPROS Pantelis, VAN VUUREN Detlef, EDENHOFER Ottmar

Publisher:

ELSEVIER SCIENCE INC

Format medium:

Printed