Here's a neat bit of visionary thinking for you. The BBC reports on a concept for large-scale food production right in the middle of densely urban areas. Like Manhattan. Or Sydney. Or even Brisbane.
For those not inclined to follow the link, the essential idea is to build a high-rise greenhouse and make it as efficient as possible: capturing solar energy on the roof, reclaiming more energy by burning "waste" material, recycling water throughout the complex and so on.
I'm puzzled about how they're going to provide sufficient light to all those plants to help them thrive. Maybe I'll find out on the project website... will let you know if I come across the answer there.
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