To my knowledge, using polluted things for better purpose is like bio-gas. We get biogas by the polluted waste and cow dunk.
In 1990s, few families had bio gas plant (using cow dunk) at their home which is a primary source of fuel in my village. But now no one has. All are having gas stoves.
Born to express, not to impress.
http://royalrobsideas.blogspot.in/
Sasi, For example, the air is polluted by smokes released by industries. So will that polluted air is useful to us? No not at all. Like this we can take many examples
Depends on the type of pollutant and the nature of emissions. Not all emissions are hazardous.
