What do you think happens

There will be a superior form of humans. We will have evolved into a better species, a kinder, gentler, more intelligent species than the one that is doing its best to destroy each other and the planet as a whole , now.

we walk on mars instead

Well, eventually all signs of our existence will vanish, and on Earth at least there will be no visible indicators we were ever here to begin with. In space, on the other hand, our relics on the Moon and in deep space will linger on for millions of years.

After the Nuclear holocaust? Well, them cockroaches and lawyers will breed a new species.

I'll be in Neptune hanging out with Sponge Bob

The Great Pyramids of Giza will survive but most of our modern-day man-made monuments will collapse. Domesticated dogs and cats will become scavengers. Animals and insects will rule the earth.

According to Thomas Aquinas, a man consist of 2 parts, the matter and form. Now I see death as the moment when my soul, the essence of who I am, separates from my body. My body, which has been the material part of me, will return to the earth, but my soul, the true form of my being, will continue to exist beyond this life. Death, then, is not an end, but a transition where my physical and spiritual parts take different paths.

The plants and animals return. The human built structures are consumed over thousands of years, reclaimed by the earth. The atmosphere cleans itself up. Another species becomes dominant, and begins consuming the planet's resources all over again until they too are destroyed.

The earth will be grateful

Nothing