This 3rd edition of the ‘Twin Tracks: Developing Sustainably and Equitably in a Carbon-Constrained World‘ by CARE International and WWF International analyses the outcomes of the UNFCCC COP21 climate talks, and the UN post-2015 development framework processes, in particular the Paris Agreement and the 2030 Agenda for Sustainable Development. The report argues that the adoption of these two major international policy frameworks in 2015 provided a key opportunity for tackling the interlinked twin challenges of sustainable development and poverty eradication, and climate change. The detailed analysis of the existing agreements, institutions and processes contained in this paper clearly shows that substantial synergies and opportunities exist for implementing these mutually supportive agreements in a coordinated way. This will help countries in the ambitious implementation of these frameworks and delivery of their national obligations.