US cities say they turn food waste into compost. Is it a problem when they don’t?

The scraps in your bin marked compost' may end up as methane. Here's what that means

When orange bins marked for compost" drop-off first started proliferating on the streets of New York in February as part of a department of sanitation pilot, many residents celebrated. I was one of them: even as an environmental reporter who has visited the landfill where my trash ends up and is well aware of the problems with food waste, the lack of convenient composting options near me was often prohibitive. Having a bin within walking distance I could access at any time meant all my food waste would finally be converted back into soil.

Or at least that's what I thought it meant, until the news broke in April that the contents of those compost" bins mostly don't go to compost sites, but to an anaerobic digester at a wastewater treatment plant called Newtown Creek. There, the food waste is mixed into sewage before being converted partially into methane.