Humanity, in the desperate attempt to fit 8 billion or more people on the planet and give them a higher standard of living, is at risk of pushing the rest of life off the globe.

We ought to recognize that religious strife is not the consequence of differences among people. It's about conflicts between creation stories.

Go as far as you can, [young scientists]. The world needs you badly.

Biological diversity is the key to the maintenance of the world as we know it... Eliminate one species, and another increases to take its place. Eliminate a great many species, and the local ecosystem starts to decay.

I like what Abba Eban once said during the 1967 war. He said, "When all else fails, men turn to reason."

We should preserve every scrap of biodiversity as priceless while we learn to use it and come to understand what it means to humanity.

The vast majority of species that are vanishing, we haven't even discovered yet. How can you possibly put them back in nature if the ecosystem is gone?