I'm no longer sceptical. I no longer have any doubt at all. I think climate change is the major challenge facing the world.

No one will protect what they don't care about, and no one will care about what they have never experienced.

The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

What humans do over the next 50 years will determine the fate of all life on the planet.

Anyone who believes in indefinite growth on a physically finite planet is either mad or an economist

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

Bringing nature into the classroom can kindle a fascination and passion for the diversity of life on earth and can motivate a sense of responsibility to safeguard it.

I just wish the world was twice as big and half of it was still unexplored.

I don’t think it makes much difference what we’re recovering from, all suffering eventually points to the need for healing.

Each moment of a happy lover's hour is worth an age of dull and common life.

I wanna go south and get some more. Hey, they say that a stitch in time saves nine, they say I better stop or I'll go blind.

I am attracted to the dark side of life!

And as for Mixed Mathematics, I may only make this prediction, that there cannot fail to be more kinds of them, as nature grows further disclosed.

The center of the stage is where I am.

The boy (then a 12 year old boy named Anatoly Karpov)doesn't have a clue about Chess, and there's no future at all for him in this profession

Is the life you seek to take worth the one you could one day create? (Savitar)

There are cultural biases built into testing, and that was one of the motivations for the concept of affirmative action - to try to balance out those effects.

The health of nations is more important than the wealth of nations.