[catone]

Prototype vertical farms. It's my new obsession.

The UN projects that arable land will decline to 1/3 acre per person by 2050 (down from 1 acre/person in 1970). I'd buy up a few old mill buildings (they're all over New England, where I live), and convert them to combination indoor farms using hydroponic or aeroponic growing systems, living space (for farmers), and retail space (to sell the food to the community and offer sales space to other local farmers).

I'd use the roof for combination solar, additional green space, and rain catchment.

[chasingsparks]

Move to Detroit. See http://news.ycombinator.com/item?id=930868 and http://www.aia.org/aiaucmp/groups/aia/documents/pdf/aiab0802...

Me and a friend have a half-baked (in more ways than one) idea that it would be fun to move to Detroit and get into aquaculture. It's something we managed to romanticize. Give it some steam-punk marketing aesthetic for giggles.

(I think half the value of HN is being able to browse your old comments to remember where you saw something very interesting.)

[petesalty]

Wow, I've been thinking about this a lot. I thought I was the only one :) Although I was kind of thinking a bit larger - building a whole new city within a city - completely self sustaining. With 100M it might be possible :)

[neicull]

I second that... I had a similar idea a couple weeks back. bravo!