alt Hacker NewsDoes orange peel not produce any CO2 / methane when left like this? I'm assuming there is some negative carbon footprint before this becomes a positive?
The ecological win definitely looks nice on paper, but whenever people talk about compost the carbon footprint / gas emissions is always at the front of people's minds, and I don't really see that discussed in the article.
The article does say
> Especially since, in addition to the double-win of dealing with waste and revitalising barren landscapes, richer woodlands also sequester greater amounts of carbon from the atmosphere – meaning little plots of regenerated land like this could ultimately help save the planet.
How long will it take for it to cross the CO2-neutral mark? Maybe a silly question, definitely not my area of expertese.
Replies
The orange peel is going to decompose and produce CO2 either way. Methane is produced when there is not enough oxygen available while decomposing, which certainly seems a possibility if it's dumped in big piles.
You're getting downvoted but it's a reasonable question if posed in good faith. The tl;dr is that there are really a few options for what could happen to those orange peels:
(1) Landfill burial
(1a) Without methane capture and use: Produces methane, relatively high short term warming potential.
(1b) With methane capture and use: Ends up as CO2 after burning the methane.
(2a) Mostly aerobic: Produces CO2
(2b) Mostly anaerobic: Produces methane
And perhaps more to the point: There isn't really a purely "no co2" way of disposing of organic matter other than perhaps burying it at the bottom of a deep mineshaft (but the co2 or methane will be produced anyway). Landfilling it is strictly worse - you still get the decomposition products, _or worse_ because you'll mostly get methane, but without producing useful soil byproducts.
Overall this project is a huge win on a carbon perspective and a waste reduction perspective.
CO2 is going to be neutral for the peels. You're just transporting it from where the oranges grew to where they were dumped. The CO2 benefit is purely from the trees and other biomass that grow where they wouldn't be growing before.
As for methane, that's a good question. Orange peels are better than most things because the limonene inhibits methane producing bacteria. But you'd still get quite a bit in the deeper piles (that produce the anaerobic conditions needed for methane production).
Spreading them out more would help, but might interfere with the beneficial effects.