Climate issues are persistent and pervasive topics within contemporary policies and legislations, demanding an interdisciplinary approach to foster legal solutions suitable for the complexity of the subject. Paradoxically, negationist claims, instead of blocking climate actions, have fostered them, leading to the establishment of a super partes scientific body that has acknowledged climate issues through the most advanced scientific reports: the UN Intergovernmental Panel on Climate Change (IPCC). Since then, many countries have adopted the findings of the IPCC as scientific basis for developing strategic policies and legislation with the aim of combining adaptation and mitigation efforts. To this extent, the EU Green Deal and the future European Climate Law exemplify such contemporary attitude. This essay analyses the aforementioned assumptions, mainly focusing on the IPCC scientific basis and the proposed EU regulation related to climate change, as well as on the role that EU Members States? legislations will play in facing climate issues.