This book examines the little-explored unilateral, bilateral, and inter-regional dimensions of EU external environmental policy, in light of the Treaty-based requirement of environmental integration, both at the formulation and at the implementation stages. The book thus explores the interplay between these dimensions of the EU's external environmental activities and international environmental law from a dual perspective. On the one hand, it identifies the legal and other instruments used by the EU to support the implementation of multilateral environmental agreements in third countries...