They haven't, or otherwise they wouldn't be testing them. The energy required to make a new plastic or paper bag is also non-negligible. And, even if you put th

They haven't, or otherwise they wouldn't be testing them. The energy required to make a new plastic or paper bag is also non-negligible. And, even if you put the bag in the trash, it still cause some environmental impact when it's transported and (hopefully) recycled.