Humans and muskrats and giraffes and birds and so on, are --
the red line goes up. That's the humans and livestock and pets portion.
The green line goes down. That's the wild nature portion.
Humans, livestock and pets are, now, 98 percent of the total world's mass
of vertebrates on land and air.
And you don't know what the future will hold,
but it's not going to get a lower percentage.
Ten thousand years ago, the humans and livestock and pets
were not even one tenth of one percent
and wouldn't even have been visible on such a curve.
Now they are 98 percent, and it, I think, shows human domination of the Earth.
I give a talk to some remarkable high school students each summer,
and ask them, after they've asked me questions,
and I give them a talk and so on. Then I ask them questions.
What's the population of the Earth?
What's the population of the Earth going to be
when you're the age of your parents?
Which I'd never, really -- they had never, really, thought about
but, now, they think about it.
And then, what population of the Earth would be an equilibrium
that could continue on, and be for 2050, 2100, 2150?