Hemp can be used as fuel too?

[+] I can't seem to get to the bottom of the hemp story. Rense posted another article about it this morning.

[+] Google blogsearch on hemp as fuel.

The problem with using hemp as fuel is that you would have to grow it-- so much of it-- that it would displace food crops-- jast as ethanol is doing now. Rense posts this article without that overview. The energy flux density of hemp or any crop is going to be far too small to support a population of 40 or 50 billion humans on Earth in 100 years-- which is the direction we want to go. The analysis of energy/power for type 0, 1, 2 and 3 civilizations has been described by a Japanese writer whose name I forgot-- which reference I need to find again.