We propose that parties commit, jointly and individually, to a goal of phasing out anthropogenic greenhouse gas emissions by 2050. Each party proposes a national emissions limitation commitment for 2020-2023 it believes is a fair contribution to the global phase out effort. Proposed commitments are subject to an independent technical review and comments by other parties. Each commitment is automatically followed by a more ambitious four year commitment until the phase out goal has been achieved. Proposed approaches to adaptation; finance; technology; capacity building; a market mechanism; monitoring, reporting and verification; and compliance are also provided.