If we recycle our own waste products, fertilizer production would automatically keep up with population growth.
Now if you think about it, that actually does make sense.
More on the potential for a revolution in the sewerage system in the ever fascinating ‘low-tech’ magazine. I might add, by the way, that if you dont read it regularly, you are missing out.
And for the record no, please dont go pooing in your compost heap, its not big, its not clever, and it might just kill you, or get you arrested – or perhaps both, which would be most awkward.