My comment wasn't meant to suggest someone was making that argument - I was just setting the premise for my question.

I dont know why my genuine curiosity has triggered so many people...I was hoping for some rational suggestions that I could incorporate into my lifestyle.

As for going back to what it was like 70 years ago....I find it unlikely. There are a lot more people on the planet than there were back then and prosperity is broadly increasing...in reality we'll transition to more sustainable and healthy living which I think entails better urban planning and greater government action on pollution.