would be interesting to see the cancer rate in countries with decreasing air pollution in 2100 or so. people who died in 2010 on cancer lived at a time with huge air pollution (1930-2010). i would say people who died in 1900 and lived from 1840-1900 or so had much cleaner air on average. much less people in cities percentual and so on.
btw people in the past didn't die much earlier than nowadays. childhood mortality was huge in the past but many people who didn't die in the first years could reach almost the same age then nowadays.
in 1870, 250 of 1000 children died in germany in the first five years of their life. in 2006, only 3.8 of 1000. you can imagine how this did decrease the average expectany of life.







