The study aims at clarifying the features of global governance based on the notion of "Unitas Multiplex", which signify the existence of the object in unitary and multiple figures in the same time. In order to do this, I want to define the transformations of the global regulatory projects after the globalization waves and the return of the market as a global regulatory regime, and analyze the conditions for equal and equitable global governance. After showing the proposal model of global regulation based on the notion of unitary emergence and pluralistic regulation, this research analyzes the debate between the two projects of global trade governance and global environmental governance, and the different formulas for treating this conflict. This research proposes finally a pluralistic model to the global environmental regulation in order to reconstruct contradictory global projects, which take in account the multiplicity of local actors and the necessity to their democratic governance and the unitary of the global project of environmental regulation. I analyzing, than, the various characteristics and configurations of global environmental governance, which form the theoretical basis of this concept, like the characteristic of the institutional multiplicity of the global environmental governance, the participation of non state actors, and the new arrangements of global environmental politics which adopt a new approach of the political economy of global environmental governance. We conclude that the trade-environment conflict should be treated in new ways through the making a non reductionist pluralist analytical frame, with a new logic in order to confront trade to environment, by viewing this conflict in multiple angles in the institutional level, and in the level of the relation between the problem of legitimacy and the notion of democracy, and in the level of the relation between society and nature. [ABSTRACT FROM AUTHOR]