For one humanity massively increased air pollution in the middle of last century since then discussions (which existed before as well) became more. Also unders

For one humanity massively increased air pollution in the middle of last century since then discussions (which existed before as well) became more. Also understanding of problems caused by this and availability of alternatives increased. We can see how life expectancy improved in areas where pollution was reduced. In the end you could mind the survivorship bias. Sure, people survived through the past, but many had earlier death due to pollution.