I'm grateful for anything that reminds me of what's possible in this life. Books can do that. Films can do that. Music can do that. School can do that. It's so easy to allow one day to simply follow into the next, but every once in a while we encounter something that shows us that anything is possible, that dramatic change is possible, that something new can be made, that laughter can be shared.

From space, astronauts can see people making love as a tiny speck of light. Not light, exactly, but a glow that could be confused for light - a coital radiance that takes generations to pour like honey through the darkness to the astronaut's eyes. In about one and a half centuries - after the lovers who made the glow will have long since been laid permanently on their backs - the metropolitan cities will be seen from space. They will glow all year. Smaller cities will also be seen, but with great difficulty. Towns will be virtually impossible to spot. Individual couples invisible.

...and when is enough proof enough?

He removed several pages of death certificates, which were picked up by another breeze and sent into the trees. Some would fall with the leaves that September. Some would fall with the trees generations later.

What kind of world would we create if three times a day we activated our compassion and reason as we sat down to eat, if we had the moral imagination and the pragmatic will to change our most fundamental act of consumption?

I wanted to tell her everything, maybe if I'd been able to, we could have lived differently, maybe I'd be there with you now instead of here. Maybe... if I'd said, 'I'm so afraid of losing something I love that I refuse to love anything,' maybe that would have made the impossible possible. Maybe, but I couldn't do it, I had buried too much too deeply inside me. And here I am, instead of there.

Almost always when I told someone I was writing a book about "eating animals", they assumed, even without knowing anything about my views, that it was a case for vegetarianism. It's a telling assumption, one that implies not only that a thorough inquiry into animal agriculture would lead one away from eating meat, but that most people already know that to be the case.