The question is not whether to close the parks, but how to accomplish this goal.

We're running out of time.

Imagine a giant asteroid on a direct collision course with Earth. That is the equivalent of what we face now with climate change, yet we dither.

We are on the precipice of climate system tipping points beyond which there is no redemption.

It would be immoral to leave young people with a climate system spiraling out of control.

Global warming has already triggered a sea level rise that could reach from 6 metres (19.69 ft) to 25 metres (27.34 yards).

What we are doing to the future of our children, and the other species on the planet, is a clear moral issue.

How long have we got? We have to stabilize emissions of carbon dioxide within a decade, or temperatures will warm by more than one degree... We don't have much time left.

What has become clear from the science is that we cannot burn all of the fossil fuels without creating a very different planet.

It's as certain that as long as fossil fuels are the cheapest energy, we will just keep burning them.

We have at most ten years—not ten years to decide upon action, but ten years to alter fundamentally the trajectory of global greenhouse emissions.

It's nonverbal: I need love. I need the thing that happens when your brain shuts off and your heart turns on. And I know it's around me somewhere, but I just can't feel it.

Sow the right words! Think the good thought.

Seldom do we think about how seldom we think.

F-E-A-R has two meanings: 'Forget Everything And Run' or 'Face Everything And Rise.' The choice is yours.

Why take drugs specifically designed to send you insane?

Commitment it's not for those who are fragile one have to be persistent

The writings of the wise are the only riches our posterity cannot squander.

It's a combination of science, maintenance, and general housekeeping. And then, occasionally, robotics activities or a spacewalk you might get to do.

I think that in human evolution it has never been as necessary to have this substance LSD. It is just a tool to turn us into what we are supposed to be.

The criterion of action is that todays work should not be deferred till the following day.