Abstract
Green-washing, market locking, false advertising, are some challenge kindled by the rise of an environnemental argument, today omnipresent on the market. sometimes revealed in institutional communication linked with the positioning of politics of sustainable development in companies, sometimes showed in the form of commercial’s messages directly addressed to the consumers, this form of argumentation has to main clause to offer a responsible image of the firm and the products and services she offers on the market.This rise isn’t free of risks and all the interest of this research has been to analyse answers which are offer by the Law and to identify evolutions bring by this phenomenon on the legal corpus.In this way, this work take us to travel at the heart of the market’s law, pass from competition law to consumption law, not forgetting agreement law which is of prime importance.