The world is so empty if one thinks only of mountains, rivers and cities; but to know someone here and there who thinks and feels with us, and though distant, is close to us in spirit – this makes the earth for us an inhabited garden. – Johann von Goethe

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 earth is like a spaceship that didnt come with an operating manual. – Richard Buckminster Fuller