This guy is on the cutting edge of urban agriculture. Troughs of bok choy stack up vertically at the urban farm in Singapore. The veggies rotate along the A-frame to ensure they receive even light. Click through to read the full article.
A net zero home can be on-grid (net metered) or off-grid. Earthships are net zero homes. They create all their own power as well as harvest their own water and deal with their own waste products. This is truly net zero, but probably not suitable for the a