If the only tool we use to analyse what's valuable is a price tag, then those things that don't have price tags begin to look like they have no value.

For a free country to continue thriving, there have to be regular reforms, because any society, any economy that stays in place, you're going to see repeated attempts to exploit the openings for twisting policy to the advantage of those who already have wealth and power.

The 'well-informed citizenry is in danger of becoming the 'well-amused audience'.

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

You can say the Earth is flat, but it doesn't mean you're going to fall off the edge.

Plant trees, Lots of trees

The cumulative amount of man-made global pollution that's in the atmosphere now traps as much extra heat energy every day as would be released by 400,000 Hiroshima-class atomic bombs exploding every day. It's a big planet, but that's an awful lot of energy.