This is an impressive and ambitious book which confirms the standing of its author as an accomplished scholar in the field of EU law. The book addresses an important contemporary challenge of the EU legal order— how to integrate EU policy on environmental protection into competition, State aid, and free- movement law. The Treaty on the Functioning of the European Union instructs the Union to ensure consistency among its various policies and activities, taking into account all its objectives and in accordance with the principle of the conferral of powers. In line with this requirement, the Treaty gives some indication of how particular EU policies should interact with others, in a number of ‘integration’ clauses. The Union must, for example, aim to eliminate inequality between men and women in all its activities, and it must aim to combat discrimination on a range of other grounds (including disability, age, or sexual orientation), when it defines and implements its policies and activities. Other factors (such as promotion of a high level of employment, the fight against social exclusion, and consumer protection) must be taken into account, while in fields such as agriculture, fisheries, and the internal market, the Union and its Member States shall pay full regard to the welfare requirements of animals.