The Brown to Green Report is the world’s most comprehensive annual review of G20 climate action, and this is its fourth edition. It has been compiled by Climate Transparency, a global partnership of 14 climate research organisations and NGOs from the majority of G20 countries, many from emerging economies. The report draws on the latest emissions data from 2017 and covers 80 indicators on decarbonisation,climate policies, finance and vulnerability to the impacts of climate change. This year it has added sections and breakdowns of climate vulnerability and looks at Just Transition. Providing country ratings, it identifies leaders and laggards in the G20.