I don't think they would have done anything differently as they wouldn't have had the technology to do what they did any other way. I can't imagine that they would have let it halt any 'progress'.
Would they then have been able to research into the methods we now do? Who knows………but I think not.
On a bit of a tangent we are not killing the world – 'save the planet', I saw a docu where the expert (I think Dr Iain Stewartson?), said we're only making it less habitable for humans and animals, the earth itself would continue on and 'recover' with new species……think extinction of the dinosaurs, the earth is still here.
Might as well enjoy living it up and let future generations deal with I say……..ignorance is bliss :wink: