Interesting - in spite of all the hyperventilating we seem to be living longer than ever before - if you look at global western experience. Mostly sanitation, medical and nutrition based. Even on the environment we are making some headway. 

But I have experienced places where breathing was risking one's lungs to a brownish chemical contaminated gas that claimed to be "atmosphere" ....

As for the current "Green Energy" focus on solar and wind - not impressed - show me something that can maintain base load ! Never mind that its impact on CO2 reduction has been irrelevant in spite of $$ B being thrown at the  issue - by politicians.