On the final day of the UN summit (COP21) held in Paris in December 2015, thousands of people defied a ban on public gatherings by converging at a boulevard leading to the business district in La Défense to denounce the new climate agreement that government negotiators were about to sign and celebrate at the conference venue in Le Bourget, 20 kilometres away. Hoping to counter governments’ attempts to control the narrative regarding the summit, they gathered behind giant inflatable ‘cobblestones’ and a red banner proclaiming “System change not climate change!”