To say we are friends of the Earth would be egoistic I think. We should be humble.
After all, we are only human, one of the many species of lifeform on Earth.
We have no control or no right to decide what would happen in our life.
We are ruled by Nature and we belong to it, not the other way round.
Still, we can definitely help make the World a better place by doing very small or little things.
This book has many examples of those little things we can / should do.
Be humble. Give all we have and do what we can.
Only beautiful people deserve beautiful live.