I didn't make any claims about its harm to the environment, merely pointing your misuse of terminology. One does not necessarily imply the other. Trash is trash regardless of whether it's inert or degradable. If it's in the environment then it's pollution. Just because it doesn't release chemicals doesn't presume it still can't harm the environment. If someone dumps a pile of shit covered biodegradable diapers in your lawn, what are you gonna call that dumbass?