French designer, Mathieu Azema, is incubating the idea of enlisting the citizens’ force to turn cities green. The awesome looking C/N Compost Bin is still in concept stage but its working is very practical. “You cannot change people but use their manners in a positive way” seems to be the motto as people are expected to continue doing what they have always done – dump waste into a bin. The paid, city municipal attendant spins the bin based on the level of decomposition required. The resultant natural fertilizer scores over the petroleum and chemical based ones.