Composting is aerated, generates soil and CO₂, not methane. Anaerobic digestion generates methane and soil, though AFAIK of a lesser quality. Per article, Calif

Composting is aerated, generates soil and CO₂, not methane. Anaerobic digestion generates methane and soil, though AFAIK of a lesser quality. Per article, California does have AD facilities, though doesn't mention composting/AD ratio. We can speculate what punnerud meant, but I would point out that Norway has some kind of a landfill ban. IIUC, they have (almost) no classical mixed-use landfills, and nearly all landfilled organic waste is actually in an anaerobic digestion or composting "facility".