Alien invasion Quote by Bobby Adair

As long as we are a single-planet species, we are vulnerable to extinction by a planetwide catastrophe, natural or self-induced. Once we become a…

— David Grinspoon

The physical extinction of the human race is one possibility.

— Vernor Vinge

I agree, along with Carl Sagan, that we should eventually become a two planet species. Life is too precious to place on a single…

— Michio Kaku

Remember this: once the human race is established on more than one planet and especially, in more than one solar system, there is no…

— Robert A. Heinlein

The fate of the vast majority of species on this planet has been extinction, eventually.

— Alice Roberts

“We are not killing the planet. It is our arrogance that makes us believe we are capable of such destruction. The earth will be…

— Luke Gracias

Mankind is destined to step beyond his earthly bonds just as his ancestors once crawled out of the seas. Colonizing new worlds . .…

— Charles Sheldon

Even if the whole human race dies off because we keep fighting and killing each other and being heartless, the planet will take care…

— Bette Midler

“The Extinction of the Human Race now underway. Watch it live as it happens - Is it too late to stop it? Search "Extinction…

— Michael Mathiesen

In the long term, it is desirable that the human race, faced with the prospect of extinction on Earth, should prepare an escape route…

— Paul Johnson

Among environmentalists sharing two or three beers, the notion is quite common that if only some calamity could wipe out the entire human race,…

— Richard Conniff

Humankind has suddenly entered into a brand new relationship with our planet. Unless we quickly and profoundly change the course of our civilization, we…

— Al Gore