Landfills have compostable materials but the landfills themselves are not 100% the same. Landfills contain many products that are not biodegradable and thus cannot be used to enrich soil as compostable materials would. Landfills are not used for growing vegetation or enriching soil either, which is another fundamental difference between the two.
Waste in landfills has trouble decomposing because it is usually packed so tightly that it just sits there without the necessary processes to break it down, i.e., photodecomposition or bacterial decomposition. Mostly, the necessary bacteria which break down biodegradeable materials aren’t present in landfills; therefore, as I said before, it all just sort of sits there. Sometimes, biodegradeable waste, if left sitting on top, will react with oxygen and produce methane, a greenhouse gas. Composting, on the other hand, quickly breaks down the biodegradeable waste and recycles it. As you hopefully can see now, landfills are not in any way oversized composting bins.
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