I can answer that in part, Joyce, and it's nice to see you again.
The first part is that we absolutely calculated the volumes. For every tonne of fish that is produced, approximately a quarter of a tonne of solid wastes is produced. I can't give you a number off the top of my head, but a substantive level of nitrates and phosphates goes into the liquid waste stream. We have not costed those. You are correct: it is an end-of-pipe sewage issue. It's as simple as that.
What we have costed, on the land-based side, is what we could do with that waste to turn it into a value-added product. For every tonne of solid waste that is produced, you can produce about 500 to 1,000 kilowatt hours of energy. That is well documented for anaerobic decomposition.
We looked at energy with this as a source, and it would account for about 5% of the energy costs of the farm. It's quite modest, but nonetheless, you could burn it to heat a co-located greenhouse very comfortably.
Then, the liquid nitrate stream is very important, because it is very dense in nitrates. The opportunity to grow fruits and vegetables is there.
We costed it from the opportunity side. We did not put a price on the end-of-tailpipe, and it's a very valid point that you make. Again, if that were to occur, it would again make closed containment even more favourable.