No doubt man has polluted the environment but all this doom and gloom stuff is a little over the top. Brings me back to grade school when they were telling me there would be another ice age by the year 2000. Many of these pollutants they now claim are showing up might be because the technology used to measure them has become more sophisticated.
Anyone remember the ozone hole hoax, taught me to be very skeptical. Grandma drove around the last several years of her life in a car without AC because the cost of fixing it had went sky high, to the ozone layer!
http://principia-scientific.org/ozone-hole-layer-hoax-dry-run-global-warming/