Can we save the World?

We don't know. Some people like astronomers tell us that the sun will burn in a few billion years. Biologists tell us that all species will become extinct, but don't say when. 

Instead of despairing or turning our backs, we have to consider how these problems might be faced. While there can be no guarantee of success, we know that our chances won't be improved by either defeatism or complacency.