Quote by Dan Brown

Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment…

— Stephen Hawking

Does humanity have a chance to survive lastingly and successfully on planet Earth, and if so, how?

— R. Buckminster Fuller

It is astonishing to realise that the human species survived hundreds of thousands of years, more than 99 percent of its time on this…

— Leonard Hayflick

There are millions of different species of animals and plants on earth--possibly as many as forty million. But somewhere between five and fifty BILLION…

— David M. Raup

“If we're going to survive as a planet with more than 6 billion people without destroying the complex balance of our natural ecosystems, the…

— Steven Johnson

The Earth's population will be culled from today's 6.6 billion to as few as 500 million, with most of the survivors living in the…

— James Lovelock

This planet might be able to support perhaps as many as half a billion people who could live a sustainable life in relative comfort.…

— Eric Pianka

“Climate change will result in mass migrations of humans out of areas that can no longer sustain life and into naturally abundant areas.”

— Steven Magee

“The World Health Organization (WHO) estimates that, worldwide over the past three decades, 150,000 people a year have died as a result of a…

— Linda Marsa

“I believe that the ten billion people expected to be present at the end of the century will enjoy a far better quality of…

— Edward O. Wilson

“It is well known that humans cannot survive long term in any environment that is not on the surface of planet Earth.”

— Steven Magee

“The last 10,000 to 20,000 years have witnessed a period of dramatic growth in human civilization. Indeed, our growth during this time is unique…

— Heidi Cullen