In practice, a global approach is needed when dealing with the problems of the spaceship earth which affect all of mankind. But local solutions, inevitably conditioned by local interests, are required for the problems peculiar to each human settlement. – Ren

The world is in balance <...>. To light a candle is to cast a shadow. – Ursula K. LeGuin

Now there is one outstanding important fact regarding spaceship earth, and that is that no instruction book came with it. – Richard Buckminster Fuller