I want to do the most subversive thing I couldn't do as a child: I want to take back the planet's future.

Humanity is creating an extinction event that will make every war ever fought a footnote to history. We belong to the only generation in history that can turn this around - we're one step away from greatness or the biggest disaster since the meteor wiped out the dinosaurs.

Change doesn't need to be overwhelming; it is not impossible.

If you can reach just 10 percent of the population, you can begin to reach a tipping point; that's where true social movements take place - it's a numbers game. And when you reach that number, the truth becomes obvious and empires of injustice crumble and fall.

A vegetarian driving a Hummer emits less carbon than a meat eater on a bicycle.

Half of all species on Earth could disappear by the end of the century because of our collective impact.

To me, you’re either an activist or an inactivist.