[Windguy]

I wasn't expecting people to eat the produce from using sewerage. But it wouldn't harm being fertiliser for biofuel, or even growing something like algae off and dumping it into an underground mine to offset the CO2 produced by burning fossil fuels. I had played a bit with these figures but for $40 Aus per ton to offset CO2 (about 2.5 tons) for 1 ton of coal would only add between 30 to 50% of the cost of coal and would equal nuclear and wind costs per unit of electricity produced. Maybe a decent initial start to ending global warming.

The other benefit is algae can clean the atmosphere of other toxic pollutants quite well, to be buried for another few million years until the next American empire rises again (after WW3 and we go back to the apes).

One further point 1 ton of (dried) algae vs 2.5 tons of geosequestered CO2 that could eventually escape seems like there is no competition.

As for canola, I don't know as it would be hard to tell compared to the other 90% of the year I have continuous hayfever.