The question of how to feed cities may be one of the biggest contemporary questions, yet it's never asked: we take for granted that if we walk into a store or a restaurant, food will be there, magically coming from somewhere.

Yet, think of it this way: just in London, every single day, 30 million meals must be provided.

Without a reliable food supply, even the most modern city would collapse quickly.

And most people today eat food of whose provenance they are unaware.

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