Of all the works of civilization that interfere with the natural water distribution system, irrigation has been by far the most pervasive and powerful.

It's not unusual to find big political shifts that take place beneath the surface before they're visible above the surface.

The ability of big money to shape perceptions - where you have four anti-climate lobbyists for every single member of the House and Senate - is a big factor.

You see that pale, blue dot? That's us. Everything that has ever happened in all of human history, has happened on that pixel. All the triumphs and all the tragedies, all the wars all the famines, all the major advances... it's our only home. And that is what is at stake, our ability to live on planet Earth, to have a future as a civilization. I believe this is a moral issue, it is your time to seize this issue, it is our time to rise again to secure our future.

I am a passionate advocate of getting special interest money out of politics.

Earlier in this century, the Heisenberg Principle established that the very act of observing a natural phenomenon can change what is being observed. Although the initial theory was limited in practice to special cases in subatomic physics, the philosophical implications were and are staggering.

I would kiss Tipper much longer.