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

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

The Earth is beautiful, and bright, and kindly, but that is not all. The Earth is also terrible, and dark, and cruel. – Ursula K. LeGuin

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