Not necessarily. Petroleum-based plastic is not biodegradable at all (there are new corn-derived plastics which are). That’s why recycling is so important, because it keeps that material out of landfills or the environment. Paper is biodegradable because it is derived from natural sources, although, again, if it’s sitting in a landfill it’s not likely to break down anytime soon. Glass is biodegradable, technically speaking, but it takes so long to degrade (I have read estimates of 1 million years!) that it’s better to recycle it instead of throwing it away.
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