No Smoking Please!!!

It's ironic, the places which are out of bounds are often the ones that are  most trespassed. Write on a compound wall - DON'T URINATE HERE and see what happens, whole junta will piss at this sign. A statutory or otherwise warning always attracts rebelliousness.
It's kind of Murphy's Law giving practical demonstrations.
More  we are becoming environmental conscious, more we are polluting. How 'Green' are the Green factories and How 'Green' are new technologies? Is Bio Diesel non polluting or a battery power vehicle leads to less emissions (over their life-cycles). We doubt that they are anyways lesser polluting than their other counterparts.
Here is a thought-