Protecting the ecosystem... kind of it's own point. Protecting agriculture would be another point.
If you have kids, do you let them come into your house completely covered in dirt?
If I didn't then they wouldn't come back in... if I do will that destroy an ecosystem, or make agriculture difficult?
Why do you keep your house clean?
Well if you ask my wife, I don't. To keep people healthy would be a reason. The home doesn't have an ecosystem to balance of course. If it did it would be because it was never cleaned.
