This updated technical paper compiles information on the mitigation and sustainable development benefits of actions, initiatives and options to enhance mitigation ambition identified in the submissions by Parties and accredited observer organizations submitted to the secretariat under the Ad Hoc Working Group on the Durban Platform for Enhanced Action (ADP) workstream 2, on pre-2020 ambition. This technical paper comprises three separate documents: the main text, contained in document FCCC/TP/2013/8, and two addenda, contained in documents FCCC/TP/2013/8/Add.1 and FCCC/TP/2013/8/Add.2. The main text contains a summary of the main findings, which are substantiated with more detailed information in the two addenda. Addendum 2 provides an overview of the options to enhance mitigation ambition and next steps under ADP workstream 2 in advancing its work plan on enhancing mitigation ambition