Nowadays it is hard to deny that we are in the "golden age of technology". Almost everything seems like a gift, because we have learnt to use so many of the resources we never before could. heck, many things can be harnessed so well now that what was once a "curse" or "plight" can be machined into a "blessing".
We can "squeeze" oils, fuels, and many other useful resources from food waste. We have become very good at ripping our garbage up into resource we can use directly.
Now, feeding humans is very important, I'm 100% in favor of feeding starving people first. but... What about nature? Bio diversity is collapsing with us eating at the roots.
Ever had a pet dog? Remember how great it felt to be full, yet still have food on your plate. You could throw it to your dog. Sure, he may never give you food in return, but that was never the deal in the first place.
What about throwing nature a bone once in a while? And I don't mean just to extract an immediate resources. Zoos are practically "evolutionarily sterile", composting usually "throws the waste food all the way to the bottom of the food chain", bio-digesting is cool, but again, just ripping out what we want right now.
What about a "bio-diversity-composte-station". An enclosed ecosystem, probably with several layers. Not aimed at "self sufficiency", nor producing any tangible output resource. Fill it up with life, animals included, and let her go nuts. The biggest problem with creating ecosystems is often we find it cannot sustain larger animals because they require more food than a small space can produce. Most of these animals will happily eat our garbage any chance they get.
I think underground would be better than above ground just to save construction costs and control possible "containment breaches". Hole through the middle of each layer floors, top layer trees, lower layer less light plants, next layer caves/night-dwelling and no-light-life, next swamp with low level water and powered lighting, finish with just water. I imagine there are tons of possible configurations besides this one, and tons of structural details that could be added to the environment. Stairwell for access, observation, resource input.
I think there is a good chance that in big cities, with all the food waste, several of these could be sustained, chewing up our waste and providing tons of cool bio-diversity/natural selection. Put them in the cities where the waste is produced and I would be surprised if handling and transportation savings could not justify a couple of these in big cities. And with plenty of observations decks it might make a cool "zoo alternative". Put em in the middle of parks maybe.
At first perhaps they require alot of babying, and perhaps with time they help us master self-sustaining ecosystem design. But more importantly, biology students would have great a place to go "digging for biological/genetic diamonds" right in town. They may also provide insights into the long term effects of changes in our food supply, and possibly even an early warning system for problems, and maybe even churn out some of the biological solutions for problems as they come up. A germ or virus hits us? we can be pretty sure it has hit these bio-diversity-stations as well.. lets go see how it is dealing with it.