This technical paper compiles information on mitigation benefits and co-benefits of policies, practices and actions for enhancing mitigation ambition, with a focus on two thematic areas: the social and economic value of carbon and the promotion of efficient public transport and energy efficiency of vehicles. It also compiles information on support for the implementation of such policies, practices and actions in those thematic areas. Information for the update was gathered at the two technical expert meetings that took place in May 2016 in Bonn, Germany, during the forty-fourth sessions of the subsidiary bodies, as well as from the relevant literature on the implementation of policy options. This technical paper has two annexes, which contain policy option tables and information on activities undertaken by international, multilateral and bilateral organizations in the two thematic areas presented in this paper.