Genetic pollution has always existed - humans have a bunch of dead viral code fragments in their DNA. Trying to remain "unpolluted" is more an OCD ideology than anything actually possible. And given all of the things out there which lead to mutations. It is just one od many which is how adaptations happen - the few beneficial ones catching on.
Not to mention complex systems are basically impossible to /not/ meddle with. Fish have accidentally been bred smaller because of practices to prevent depletion by giving immature ones a chance to grow to adulthood. Heck there is evidence that fear of humans is bred in animals.
Not to mention complex systems are basically impossible to /not/ meddle with. Fish have accidentally been bred smaller because of practices to prevent depletion by giving immature ones a chance to grow to adulthood. Heck there is evidence that fear of humans is bred in animals.