Sixty percent of emerging infectious diseases are zoonotic, originated in animals & more than 2/3 of those originate in wildlife.
In last 4 decades all major viruses are result of Human encroachment in wild areas.
nytimes.com/2012/07/15/sun…
AIDS, for example, crossed into humans from chimpanzees in the 1920s when bush-meat hunters in Africa killed and butchered them.
Disease, it turns out, is largely an #environmental issue.
When we break the ecosystem, say an intact tropical forests, by removing something we remove the protective link also.
thehindu.com/sci-tech/scien…
cifor.org/library/6636/
biodiversity can cause many such issues. The ecosystems are evolving from long, with checks & balances. Removal of something unchecked remove the balance as well as safety net. Less linkages make system unhealthy.