Magali Dreyfus, Centre national de la recherche scientifique (CNRS)
From citizens who sit on the boards of energy companies to neighbourhoods that help fund local wind farms, community action is critical to the environmental movement.
If Donald Trump turns away from climate action as George W. Bush did, Europe and China can respond by forming an alliance that will turn the United States from a climate leader into a follower.
The latest climate summit began the long slog towards putting the Paris Agreement into action. But it generated more questions than answers, particularly on how to handle a Trump-led United States.