Chemtrails have already succeded.
I guess by looking at some of the comments that have been posted here, maybe Smart Planet isn't. All nations pollute. Every one pollutes. You can't live without polluting. Pre-industrial societies polluted as they used coal or wood for heating and cooking needs. Right this minute, if we all went back to living off a plot of land and cashed in all our industry, we would still pollute and the atmosphere would continue distribute this pollution around the globe.
Perhaps, there is another factor at play that most don't seem to connect here. Population. We are too many for the eco system we find ourselves confined. Like anything else, when you have too much or too many of anything, viability is put in question on this little planet. The chemicals and other pollutants that are let lose into the atmosphere by refining and other manufacturing processes have boomed across the developing world only because we demand the product. That "we" is an incredible number.
The atmosphere is a limited and closed loop resource that we will continue to compromise by the volume of our existence and carelessness. Like all closed loop systems, it will be self limiting. Humans have set a very interesting global experiment in motion, and now, all we will be able to do is watch it's outcome.
Chemtrails are a nice diversion from a reality too complex for many to fathom. I love simplicity, too!