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“Dr. S. Dillon Ripley, secretary of the Smithsonian Institute, believes that in 25 years, somewhere between 75 and 80 percent of all the species of living animals will be extinct.”

Years Believe Earth Animal Percent Species Secretary Drs Institute Earth Day Smithsonian

Author:Gaylord Nelson

“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 species have existed at one time or another. Thus, only about one in a thousand species is still alive--a truly lousy survival record: 99.9 percent failure!”

Stills Different Earth Animal Millions Records Five Alive Thousand Survival Percent Plant Species Billions Fifty Forty One Time

Author:David M. Raup

“It is astonishing to realise that the human species survived hundreds of thousands of years, more than 99 percent of its time on this planet, with a life expectancy of only eighteen years.”

Years Humans Planets Evolution Percent Species Realising Survived Astonishing Eighteen Human Species Expectancy Life Expectancy

Book:How and why we age

Source: How and why we age

“Somewhere close I knew spear-nosed bats flew through the tree crowns in search of fruit, palm vipers coiled in ambush in the roots of orchids, jaguars walked the river's edge; around them eight hundred species of trees stood, more than are native to all of North America; and a thousand species of butterflies, 6 percent of the entire world fauna, waited for the dawn.”

World America Tree Thousand Percent Hundred Rivers Roots Species Fruit Edges Eight Dawn Native Butterfly Crowns Bats Palms Flew Spears North America Biodiversity Orchids Ambush Vipers Jaguars

Author:E. O. Wilson

“An asteroid can literally destroy 80 or 90 percent of the species that are alive on Earth. These are big events. I mean, this is called extinction.”

Mean Bigs Earth Alive Events Percent Species Extinction Asteroids Big Events

Author:Rusty Schweickart

“For millennia the two-million acre redwood ecosystem thrived and sheltered myriad species of life. In the last 150 years, 97 percent of the original redwood forests have been destroyed by timber corporations. ... Big business cut-and-run logging operations have instilled a false dichotomy: jobs versus the environment.”

“We are clearcutting virgin forests around the world, and 95 percent of species in the clearcut zone have never been studied. So we clearcut a part of the virgin forest and now part of our ecosystem has been wiped out. Some of it may grow back, and some of it won't.”

World May Has Beens Grows Percent Species Forests Around The World Zone Virgins Ecosystems

Author:Horst Rechelbacher

“Even if we planted a tree on every square yard available in the planet by the end of the century we would only capture at most 10 percent of the CO2 we need to reduce. This does not mean that we should not plant trees; we should, for biodiversity's sake, and for our long-term future together with the other species.”

“We don't need to clear the 4 to 6 percent of the Earth's surface remaining in tropical rain forests, with most of the animal and plant species living there.”

Needs Earth Animal Clear Tree Percent Rain Plant Species Surface Forests Tropical

Author:E. O. Wilson

“99.99 percent of all species that have ever lived are no longer with us.”

Percent Species

Author:Bill Bryson