There are hidden costs.. The system is not closed systems. It require constant energy sources to keep water pumping. adding nutrients for all the plants. And there are also additional hardware costs to raise plants from seeds to young plants before transplant them. It can be a very labor intensive.
seeking44666 發表於 2012-4-7 04:30
There are hidden costs.. The system is not closed systems. It require constant energy sources to ...
In fact, those problems you've mentioned are included in the above video.
They are finding and certainly have found numerous solutions.
