Maybe the steam engine or the internal combustion engine? If we had prioritised renewables sources of energy, or public transport over cars we might be in a better place to tackle global carbon emissions.
I think Plastics would be a good area to undiscover. Yes it moved technology along and became a super useful material but as we are all aware now, the impact of all the waste that does not rot away is a major problem now.
That’s a hard question because many useful things have come from inventions that we would see as bad. The atomic bomb is a good example of something that I would want to get rid of, however the science behind it gave us nuclear power which is a clean way of making energy.
I would stop the ‘discovery’ that vaccines cause autism, because it has caused parents to stop vaccinating their children and led to a rise in entirely preventable diseases
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