Defining European policies in provision and financing public goods and services, environment defense is a core challenge for the building of a political Europe. Rather than a political answer, this programme invites to advance the part of economic theory addressing these crucial questions. Topics include pure public goods and public projects, all kind of impure public goods, public goods as production inputs, externalities, environment. The outcome of the programme will be the creation and development of an effective research network mixing theorists, specialists of political economy and of history of economic analysis and practitioners of public economics.