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That sounds very efficient. In the US organic and non-organic "kitchen" waste is often combined. While it is becoming more common to separate compostable materials from others it is still more of an exception.

Many landfills do harvest methane from the combined heap of trash. However, after methane production ends we are still left with compost with tons of plastic.

You can think of the plastic as sequestered carbon!

Until it starts burning, or should I say smoldering. Then you can think of it as a multi-ton slow-release toxic gas grenade.

Volatile Organic Compounds. Hey, it says "organic" right in the name. It must be good for the environment.

Sure, if you forget the fact that it used to be much much more "sequestered" before we spent energy extracting those hydrocarbons. Not to mention that the plastic will eventually erode into the oceans since it isn't buried deep enough. Kinda like a time release pill, except for microplastic pollution.

Typical Japanese household trash separation and disposal rules (pdf link): http://www.city.nagoya.jp/en/cmsfiles/contents/0000022/22536...

Compost can be used, plastic can be reused, no?

But when they're mixed together neither can be easily used, and separating them at that point is difficult.

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