The relationships between arbitration and European Environmental Law, including its health and climate aspects, have not been much considered by academic research although they are a factor in arbitration’s lack of “social acceptability” in the views of the EU’s institutions. Yet, arbitral practice apprehends it, to diverse extents and with different logics, in investment as well as in commercial matters. Thus, the investor-state dispute settlement system takes account of environmental considerations, including European protection standards, in a manifest and diversified manner. As to commercial arbitration, its capability to resolve environment-related disputes is even less doubtful, to the point where discussions now arise as to its possible use as a forum for climate justice.