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The simple answers to the questions that get asked about every new technology:
Will [blank] make us all geniuses? No
Will [blank] make us all morons? No
Will [blank] destroy whole industries? Yes
Will [blank] make us more empathetic? No
Will [blank] make us less caring? No
Will teens use [blank] for sex? Yes
Were they going to have sex anyway? Yes
Will [blank] destroy music? No
Will [blank] destroy art? No
But can’t we go back to a time when- No
Will [blank] bring about world peace? No
Will [blank] cause widespread alienation by creating a world of empty experiences? We were already alienated
Leaded avgas is only used for piston aircraft, and most countries use a grade that contains minimal and only for engines that require it.
I think the real issue is even though we have stopped a lot of the pollution our land was so thoroughly drenched in it activities as mundane as burning firewood release large amounts of lead.
https://www.theguardian.com/environment/2026/may/15/wood-burning-for-heat-reintroducing-lead-pollution-into-the-air-us-scientists-find
That means it is so blanketed that is going to take global scale remediation to solve the problem. That is mind bogglingly destructive levels of environmental degredation.