Compost.
More CO2 for a greener planet.
I’ve been growing my all own vegetables and fruits vertically for years in NYC.
With towers I can grow 30-50 sqft worth of short produce in only 2-4 sqft. And with climbing plants on a sunny roof, fuhgettabout it. I have to give away hundreds of pounds of cukes, melons and squash every year. In the winter my pantry is overflowed with canned veggies and potatoes.
Even in shady areas it is amazing how much you can grow with good soil. I compost all my organic waste and estimate about 10 more years before I need to buy any fertilizer.
Compost.
More CO2 for a greener planet.