Perspectives on Federalism is a free on-line peer-reviewed journal, promoted by the Centre for Studies on Federalism.

Environmental protection and sustainable development are competences that the EU is entitled to integrate into the definition and implementation of its policies. However, shared competences in these areas are still a reality, as a margin of discretion persists for Member States, aimed at maintaining a high level of decentralisation, particularly where issues related to national policies and more (nation) specific sectoral legislation are concerned. This paper intends to analyse the application of the principle of subsidiarity to environmental issues within the EU, to examine the characteristics of a possible path to the future of green federalism in Europe.