The earth
As you know, the Earth is really old and we, the humankind, represent only 1% of the Earth seniority. The longest kind of earth were the dinausors. Earth is today being in danger because of humankind and the evolution that we caused within technological devices and pollution. If I can say someone's quote that would be "Everything is being transformed into energy and nothing is lost". But as we are acting today, we are always wasting energy that can be reused for other purpose. A great man once said "Humanity can not get anything without giving something back. For each thing received, one must give up another of the same value". But as we are today, we are not respecting this statement, it may be my personal opinion but I think that one day, we are going to pay for everything we have taken from Earth.