Malthus and Julian Simon

Part of an ongoing conversation, Necoras comments: "A growth economy, which is necessary if you are to have an increasing demographic, requires ever growing resources. This worked well as long as we were exploring into the US, and Africa, etc, etc. Eventually we'll use up the easily available resources (likely within a century for some rarer elements) and the economy will slow. There are a few options at that point.

1) Expand. There are a number of places to do this. The oceans are one, space is