I'm thinking about building the Food Computer (and potentially a Food server if all goes well) with the kids at our school, I became interested in the OpenAg project after hearing of it as a potential solution to producing food sustainably and at scale.
However, after looking into the hydroponic systems a bit further, I understand that the sources of nutrients used in the growing medium is a) non-renewable, meaning i have to continuously buy more and b) produced using energy (from oil and gas) and water intensive methods. As such, I'm concerned that this method of growing is, in fact, highly unsustainable when scaled up and over long periods of time.
As the sustainability aspect of the method is key to how we plan to use the Food Computer at the school as an educational resource, does anybody out there know of a genuinely sustainable way of getting the nutrients into the water/growing medium?
At school we're looking at cycles, and so the Food Computer seems great at solving problems when water is scarce, but given how critical the nutrients are to growing food, I'm hoping theres an answer out there that could also do this sustainably.