This is something I've been struggling with recently.
Considering that humans are a significant cause of climate change, which has already had environmental, ecological, and global health impacts, is it really ethical to continue trying to extend human life? It sounds grim, but isn't it possible that decreasing the human population (or at least no longer extending human lifetimes) is the best way to maintain the health of the planet, other animal populations, and the human population as a whole? Especially since global warming is expected to increase the probability of events like disease outbreaks and natural disasters, which could increase mortality regardless, might a smaller human population before further environmental damage occurs be the most ethical option?
I understand that the issue is obviously not this clear cut. A smaller human population may not dramatically slow or decrease climate change. Also, just like everyone else, when there's someone dying in front of me there's no way I can look the other way, but I think that makes the question more difficult: Is what I feel most ethical at the time actually most ethical in the long run?
TL;DR: Is it ethical to practice medicine if by doing so I indirectly contribute to the destruction of the planet and damage the health of the human population as a whole in the future?
I'm curious to hear other perspectives on this (and potentially reassure myself of my career choice).
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