The book develops a study on Ecosocialism, a current of socio-environmental thought and action, with the central objective of analyzing the advances and challenges of international ecosocialism, with more depth in the political parties of France and Brazil. To this end, it first presents the motivations for the concrete actions of ecosocialism.

It discusses how the socio-environmental crisis is developing and its risks for humanity. It then sets out the various forms of socio-environmental proposals for dealing with the crisis, their divergences and convergences.

Subsequently, it presents in more detail the thinking and action of the ecosocialist current and how it is present in French party politics. Ecosocialism in Brazilian party politics is analyzed in terms of its history and perspectives.

The results of the research show that, despite having limitations, such as resistance from the traditional left and poor electoral performance, the ecosocialist currents in French and Brazilian party politics have grown in internal debates and can evolve by increasing their interaction with social movements. .