Only around 2% of the earth's surface is cultivatable land.

What I worry about is climate change, because that would have untold effects that we can't even measure yet.

There is no degree of human suffering which in and of itself is going to bring about change. Only organisation can change things.

If the economy becomes disembodied from society it can only lead to disaster.

As the rich consume more and more, they are clearly not going to want to downgrade their own status.

This erosion of the middle class is happening all over the place. The opening of a wider gap between rich and poor is always accompanied by such a process.

We have the most crude accounting tools. It's tragic because our accounts and our national arithmetic doesn't tell us the things that we need to know.

The Sierra Club in the United States has now really come out for population control and reduction.

I used to work a lot on food issues and every time somebody predicted that production would be inadequate they got egg on their face a year or two later.

We're trying to run a 21st century society and economy with 19th century Darwinian, competitive, crude ideas.

If you cut down a forest, it doesn't matter how many sawmills you have if there are no more trees.

The truth is crazier than lies because lies are required to stick to possibilities—the truth isn’t.

Where there is no integrity, there is no unity.

All of us, all living things, have the potential to change.

Sky, wait.” The way his voice wraps around my name makes me wish the only word in his entire vocabulary way Sky.

To say the word Romanticism is to say modern art - that is, intimacy, spirituality, color, aspiration towards the infinite, expressed by every means available to the arts.

When I give this talk to a physics audience, I remove the quotes from my 'Theorem'.

We are sitting on many powder kegs. Whether it's Ferguson, or St Louis, or like the other night, or Baltimore. Or different parts of Chicago.

Taste is a matter of ignorance. If you know what you are tasting, you don't have to taste.

She was one of those, who, having, once begun, would be always in love.

Oh my heart, there is another way to love. Do not love the gift for what the gift is. Love the gift for Who it came from.