One calls herself Lumette and the other Lucie. They have hidden their hair under a wig and are wearing hoodies and masks. Because what they're doing could be punishable by law. But by choosing to deflate the tyres of SUVs, a cross between a minivan and a 4x4, these two young activists intend to "wage war" on all those motorists who "don't give a damn about anything that's happening today" while "our planet is burning". We report from a middle-class neighbourhood in western Paris, where they deflated the tyres of a dozen cars in the space of an hour. IMAGES AND SOUNDBITES