Humans are products of nature, therefore whatever we do is 'natural'. There aren't natural chemicals and artificial chemicals, there are just chemicals. The whole distinction is silly. Nightshade will kill you just as a dead as synthetic atropine.
Doing anything will likely have unintended consequences, I would hazard a guess that vaccinating people has saved more lives than AIDS has claimed. Now that we have an AIDS vaccine, should we not vaccinate people for fear of causing an epidemic 80 years from now?
I don't think that anything we do is natural just because we are a product of nature. It's getting into definition and semantics here but something like cross breeding a chicken and a pig can't be called natural as far as I'd say.
I suppose that is not possibe but can you imagine chicken bacon?
Doing anything will likely have unintended consequences, I would hazard a guess that vaccinating people has saved more lives than AIDS has claimed. Now that we have an AIDS vaccine, should we not vaccinate people for fear of causing an epidemic 80 years from now?