Municipal elections in France just yielded a string of victories for environmentalists, with several major cities swinging Green.

The unprecedented showing for Europe Écologie Les Verts, a once minor political party, means Green mayors will take charge in Marseille, Lyon, Bordeaux and Strasbourg. The party also came out on top in mid-sized cities such as Tours, Besancon, Annecy and Poitiers, while retaining control of Grenoble.

Even Paris mayor Anne Hidalgo was re-elected with the Green Party’s endorsement, causing French media to upgrade their description of the “green wave” to a “green tsunami.”

It’s too soon to call...