In spite of progress made to date and the significant long-term ambition announced by many countries, climate policy actions remain insufficient to meet the Paris Agreement objectives. While several international initiatives aim to track and monitor climate policies, there is not yet a “go to” place for a comprehensive inventory of policy actions and best practices worldwide. Such a platform would also ideally serve to compare policies’ effectiveness reflecting the diversity of country circumstances. Progress in this direction would help to promote an ambitious but globally more coherent and better-coordinated approach to emission reductions through a broad range of policies. This report lays out a roadmap for data and analytical work to support this aim, with a view to enhancing global dialogue and building trust on issues spanning climate change mitigation policies and their macro-economic repercussions. Key elements to strengthen the assessment and comparison of countries’ climate change mitigation policies across countries include: broadening and deepening the stocktaking of mitigation policies; extending and agreeing on an operational methodology for estimating the impact of these policies on emissions and on potential metrics to compare them; and assessing the broader economic effects of different climate policies.