A not cheaty way to prevent leaves from decaying. A block, C02 recycler. Place it on your oxygen room, near to trees and leaves,grass flowers etc. And it will prevent leaves from decaying in that sealed area or/and bubble. It will feed Carbon-Dioxide to the plants and trees near it. While the oxygen collectors collect oxygen, Co2 recyclers create carbon dioxide to the plants. How to make it work: Simply put something that breaths,near it. (Pigs,Sheep,Cows,Chickens,Dogs,ocelots,Cats...)