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SALT ??
I can't stand Packham, but I see little to disagree with in the OP article.
The world has too many people and it's going to be bled dry. Uncomfortable to hear, but we are using P, K, Salt, oil, gas, (to name a few) resources and carving the planet up into a mess.
I think super bugs will do the job of controlling population, and at the rate we travel around the world these days we would be pretty effective at spreading a disease to most parts of the planet.
All cheery stuff
SALT ??