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Although labor law is dedicated to the regulation of salaried employment relationships, it has also made room for ecological concerns. Both positive law and academic writings are taking up environmental issues. While this trend towards the environmentalization of labor law is on the increase, it is not without its limits, which are due in particular to the prevalence of a growth paradigm and the weight of separations (separation between man and nature; business and the environment). The ways in which labor law integrates environmental concerns are thus marked. Whether direct or indirect, the incorporation of environmental concerns comes up against a glass ceiling. Only the environmentalization of economic law, of which labor law is a part, can break this glass ceiling.