[sydbarrett74]

Single-use bags are no more biodegradable than multi-use ones. They photodegrade when exposed to sunlight, and fissure into smaller pieces due to weathering, but their chemical nature is not altered. (I'm ignoring certain niche conditions under which microbes have evolved the capacity to biodegrade certain plastics.)

[THJr]

Yeah, the biodegradable part of the article is more about paper vs. plastic in general rather than single vs. multi-use.