On Saturday, as U.N. climate negotiations plodded toward a finish, Friends of the Earth International staged a geolocation action. Its activists spread out to key points across Paris and transmitted their locations via GPS to spell out “Climate Justice” and “Peace.”

"climate justice peace" on map
ClimateJusticePeace.org

The day before, Greenpeace used “eco-paint” to turn the streets around the iconic Arc de Triomphe into a giant sun. Message: Go solar, go renewable. Video from Mashable:

Greenpeace also dangled a special message for the French president off the Arc de Triomphe: “Mister Hollande, renew the energy.”

A Greenpeace activist hangs with a banner reading "Mister Hollande, renew energy" from the top of the Arc de Triomphe during a protest on the Champs Elysees avenue in Paris, France, December 11, 2015 as part of the World Climate Change Conference 2015 (COP21).
Reuters / Charles Platiau

A week earlier, activists spelled out exactly what they wanted from COP21:

activists spelling "100% renewable" with their bodies in front of Eiffel Tower
Yann Arthus-Bertrand / Spectral Q