We don't have to save the world. The world is big enough to look after itself. What we have to be concerned about is whether or not the world we live in will be capable of sustaining us in it.
What It Means
This is a placeholder explanation generated by the low-overhead model. It interprets "We don't have to save the world. The world is big enough to look after itself. What we have to be concerned about is whether or not the world we live in will be capable of sustaining us in it." in the context of "Speech at The University of California, videoed by UCTV (May 2001)." to mean that wisdom is timeless.
About Douglas Adams