Book excerpt: Climate change is causing traditional political and legal concepts to be revisited. The emergence of a global polity through physical, economic and social interaction demands global responses which should be founded upon new principles and which cannot simply be modelled on traditional constitutionalism centred on the nation-state. This Research Handbook explores how to build this climate constitutionalism at a global level, starting from the narrative of Anthropocene and its implications for law. It provides a critical approach to global environmental constitutionalism, analysing the problems of sustainability and global equity which are entwined with the causes and consequences of climate change. The Handbook explores how to develop constitutional discourses and strategies to address these issues, and thereby tackle the negative effects of climate change whilst also advancing a more sustainable, equitable and responsible global society.