Quoted from Rdoyle1978:PLA is compostable but requires constant high temperatures or a basic additive to break down the hardened molecular structure, and while it takes a LONG time on its own (but hundreds of years less than typical plastics), it will break down in a landfill. It is consumable by bacteria (the basic effect of composting), which is the literal definition of biodegradable.
The other attempts at creating PLA out there are to create a polylactic acid which breaks down even quicker under non-controlled conditions. Definitely would be a good step forward
Actually it is not. While the definition to be able to label your product "Biodegradable" is very strict there is a massive difference between that and "degradable" which is not minor at all and these terms are often times used out of context.
Technically, every product on earth is degradable, because it will eventually break down either biologically or chemically.
Biodegradable, meanwhile, is a product that will be broken down by organisms or bacteria.
Traditional petroleum-based plastics and other heavy metal and chemical based materials fall into the category of degradable, but not biodegradable. They never break down fully into their natural elements to be repurposed by the earth; merely into smaller pieces over a long time.
Plastics are the biggest offenders, because they’re either photo-degradable (break down in sunlight) or oxo-biodegradable into smaller pieces called microplastics.
My Packaging company manufactures product that is MRF, municipal recycle facility approved meaning the fibers, print and coatings can be 50 state recycled and will biodegrade within months as if it were never here though we cannot technically call it biodegradable because it can take a bit longer than 180 days to do so.
Remember, just because you can't see something doesn't mean it's gone. Plastics are the best example we have of this.