[https://www.who.int/news-room/fact-sheets/detail/malaria] - kills over half a million people a year.
[https://science.utah.edu/news/toxic-dust-hot-spots/][https:/...
[https://www.mayoclinic.org/diseases-conditions/chagas-diseas...]
[https://www.un-igrac.org/sites/default/files/resources/files...] ground water arsenic levels, nice maps start on page 5.
[https://sustainability.stanford.edu/news/new-study-allows-re...]
All are driven by these factors, and there are many many more.
And that isn’t even factoring in things like natural ground water Arsenic and Uranium contamination which poisons millions in many areas.
Near as I can tell, you’re just living in areas that are the equivalent of ‘the good side of the tracks’.
If you think Nature works at smaller scales than man, you’ve never spent time in Nature.
Can we make things worse? Sure! But there are also plenty of real, large scale, natural hazards out there.