What does that mean concretely?

Would you have something like an exchange rate where 2000 chicken lives = 1 human life?

More like "if all the bugs die because we use too many pesticides, the systems that support life on this planet will collapse."

> What does that mean concretely?

E.g. you value your spouse more than you value a random other human. It doesn't mean you don't value the other human.

You can assign a value to both that says we should not harm these things.