Graffiti is a meaningful form of artistic protest that can reach a populous audience who might not otherwise be aware of an issue. But when your issue is the environment, using chemical spray paints as a medium can defeat the message. For many activists, sustainable street art is the answer.
Moss art
To make moss art, get a blender set up and ready to go. Pour 700ml of lukewarm water into the blender, then Crumble three handfuls of moss (can be found between the cracks in pavement, on drainpipe covers, urban backyards, anywhere it's damp and shady) in the water.