There are no separate systems. The world is a continuum. Where to draw a boundary around a system depends on the purpose of the discussion.

There is too much bad news to justify complacency. There is too much good news to justify despair.

It is not OK in this culture to talk to friends about causes you believe in, much less to ask them to join in. It's OK to blast perfect strangers with crass messages every hour of the day, but it's a tinge embarrassing, it brings up some shyness, it seems an intrusion, it risks rejection to share real heartfelt commitments. It's easier to share our cynicism with strangers than our dreams with friends.

A good leader sets the right goals, gets things moving, and helps us to discover that we already know what to do.

The sustainability revolution will be organic. It will arise from the visions, insights, experiments and actions of billions of people. The burden of making it happen is not on the shoulders of any one person or group. No one will get the credit, but everyone can contribute.

George W. cares as much about climate change as you would expect from a Texas oilman

You should issue demerits for tree cutting or the destruction of humus.