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Old 01-01-2010, 01:01 PM   #21
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Originally Posted by ERD50 View Post
I came across this article and thought it was an interesting sidebar to this thread - this guy is looking to turn large parts of empty Detroit into urban farms....

Farming: One way to try and save Detroit - Dec. 29, 2009

There is also SPIN Farming. Also urban but on a smaller scale. I don't know if there are any SPIN farmers in Detroit but it wouldn't surprise me at all.

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Old 01-01-2010, 01:16 PM   #22
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Originally Posted by harley View Post
I don't think anything is sustainable in the long run, anyway. Entropy, anyone? I haven't heard of a single situation (outside of a sci fi novel) where you can produce more energy on less energy expenditure. Not to say we shouldn't attempt to minimize waste, but I don't think any of these smart guys have the answer. Either they all have their own ox to gore, or possibly the problem is too complex for us to figger out. Le sens commun n'est pas si commun.
Originally Posted by growing_older View Post
I don't think this has to be a closed - zero energy input system. Any input of natural solar energy, or wind/thermal power or anything which is renewal is still sustainable (at least for thousands, if not millions, of years).
In a way the question of sustainability could be seen as a variant on determining a SWR for a retirement portfolio. Given these asset classes, each with its own rate of return (natural resources), this inflation rate (population growth), and this life expectancy (for human civilization), how much can we withdraw annually from the "portfolio" without exhausting it?

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