Thesis: In the 70s, European countries have started seeing a significant politicization of environmental issues. This trend was expressed by political parties through a platform of environmental public policies during political campaigns, as well as the setting of environmental budgets by the presidents during their terms of office. By means of five essays falling into the scope of the Public Choice School of Thought, this thesis aims at determining whether politicians’ behavior have been motivated by self-interest or rather by global well-being satisfaction.The first chapter examines how environmental issues have integrated the spectrum of French political parties of all ideologies whereas the second chapter analyses the determinants of an environmental offer and this within the European political parties since 1970. Chapter 3 and 4 focus on environmental public spending done dy European countries since 1995, and analyze the application of the environmental political pledges and the impact of the electoral rules inplace on environmental public spending at both, the central budget scale and the total budget scale of states. Chapter 5 compares political entrepreneurship to associative entrepreneurship and market entrepreneurship to determine the most efficient way of solving environmental issues.