Just my .02 observation. Where I live we enjoy some of the most pollution-free air of anywhere on the Planet by simple virtue of our isolation. An air sampling facility was built here in the late 60's right at the tip of the main island, Tutuila. Wonder of wonders, it's still working. If it had been left to Samoans to look after... Anyway, every few months a technician comes down from hawaii to check on things and from time to time, I'll catch an interview on the local TV Station with this guy. For the last few years he's been saying that Greenhouse gases (and he loves to rattle off an impressive list of names) that are being detected here are growing exponentially.
We are also starting to see dogs with cataracts, apparently caused by a depleted Ozone Layer.

OK, Der Hammer, feel free to shoot me down yet again.

Have you ever noticed that the guys with their heads shoved farthest up their butts scream the loudest?