Do you have examples where human presence help the environment?

I don't know some, obviously there are constant changes, normal ecosystems are strong due to their biodiversity, so they recover and adapt quicky. With humans there are holes, more room for strong diseases. It's like on a more local scale the health of an average rich country human, it's very weak and subject to diseases, because of a bad lifestyle. If for a decade this lifestyle is changed with more diversity, interaction with nature, the change is incredible, it's the same at larger scales