Change Quote by John M. Grunsfeld

“These days, there seems to be nowhere left to explore. Victims of their very success, the explorers now, pretty much, stay home. Maybe it's…

— Carl Sagan

As our planet faces seemingly insurmountable odds, we must find new ways to survive and thrive together.

— Nikhil Advani

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

To survive, humans need food, water, and air. Yet biodiversity, the Earth's bodies of water, and the planet's atmosphere are all under threat.

— Graciela Chichilnisky

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

We have the capability - physically, technically - to protect the Earth from asteroid impacts. We are now able to very slightly and subtly…

— Rusty Schweickart

The conservation of nature, the proper care for the human environment and a general concern for the long-term future of the whole of our…

— Prince Philip

Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.

— Stephen Hawking

To reconnect with nature is key if we want to save the planet.

— Jane Goodall

Our biggest threat is not an asteroid about to crash into us, something we can do nothing about. Instead, all the major threats facing…

— Jared Diamond

The sooner we become a multi-planet species, the safer the species is, and the stronger the guarantee that we're going to continue to evolve.

— Ron Howard

The major threats to our survival no longer stem from nature without but from our own human nature within. It is our carelessness, our…

— M. Scott Peck