Humans living on this planet have barely arrived about 100,000 years ago, so it would be wrong to say we are owners of this Earth. For that matter even caretaker of this Earth. Dinosaurs have lived on this planet for time periods longer than that of humans and they did not own the Earth or care about it. Most probably, we as species would not live for more than a million years. That is very very less in evolutionary timescales and would not matter to anyone.
We have occupied Earth, created religions, created gods, demi-gods, gods among human, societies, vegetarians, vegans, hippies, music, arts, mathematics, respect, emotions, hatred, sexiness etc. The point being that almost all the concepts/ideals we live by, are anthropomorphic and have no actual significance. For all we know societies could have developed where treating people with kindness was looked down upon. Animals were not allowed to mate. Various bizzare things could have happened. What we are witnessing is a particular kind of society which developed. There was no reason for it to be preferred over other models of society. Being emotional beings, people wanted to give "meaning" to life, "meaning" to death, "meaning" to cat crossing the path. Hell, meaning to everything. We wanted everything to hold significance in our lives coz as humans we are darn special. We are better than other species.
Truth is(in my perspective), lives have no meaning. There is no better reason to live a life than is to start building large temples in the middle of the road.
Given this perspective, that nothing in life is meaningful many people become cynical. They dread the fact that since life has no meaning there is no reason to live and hence one must die. Of course, no reason to live comes with no reason to die too. Some things give us happiness and some things make us sad. Most of this could be conditioned by our society or for that matter evolution too. Helping other makes us feel good because we have been taught that it is a good thing. Feeling envy is bad because our parents have told us so, movies around us, teachers around us. Of course there are other "universal" pleasures. Most people like sweet dishes and desserts. That is coming from evolution. Natural selection makes sure that you like whatever will make your body more active for reproduction. Sweet things inevitably contain glucose which gives energy. I must say that evolution does not work in hindsight. It did not realise that making people such that they like sweet things could have bad consequences. People getting diabetes, impotency and other diseases as a direct or indirect consequence of glucose are side effects of making the body like glucose. Natural selection will act and make people in which these tendencies are limited. That will take a long time. Anyways, I digress.
Noting that point that lives do not hold purpose and our emotions are conditioned or evolutionarily trained we ask ourselves what to do with this long boring life. Should we go kill ourselves or should we write blogs or should we contemplate life or should we read Proust.
This is where the answer is very very simple. Do what you like. Find peace in the fact that nothing is going to matter. Anarchy, corruption, sadness, death hold no more meaning that kindness, greed, love, happiness etc.
Nothing is forever.
