Managing change and translating change into legal language is a transversal and continuous conceptual challenge. The purpose of this post-conference monograph is to outline the impact of the European Green Deal on the Union’s regulatory framework and thus to discuss the unprecedented impact of climate change, and the parallel challenge of ecological transformation. Indeed, rendering Europe the first climate-neutral continent in the world requires legislative action in various fields of the Union’s competence. Whilst an environmental ambition of the EU is currently on the rise, it must be adequately balanced with economic and social realities. This means that the greatest challenge for EU legislator at present is the coherence of the choices to be adopted. In October 2022, in a context of Jean Monnet Module ‘Sustainability and Climate Change in EU Law’, an international scientific conference (JMM Autumn Sustainability Event 2022) was held at the Jagiellonian University. A group of researchers from most of the EU universities and beyond discussed processes and structures, dynamics and complexity, as well as threats and opportunities related to the search for coherent legal solutions ensuring the effective fight against climate change in the EU. Whilst disseminating knowledge about the EU Green Deal implementation, this monograph is meant to inspire further interdisciplinary reflections about the coherent way to address climate change in EU law.