My take on this is that it's more sustainable to reduce. Use glass mason jars to get peanut butter at a co-op or bulk food store, and reuse the jar over and over again. Then you're not buying a new jar every time you want peanut butter.

@THelper, that's kind of a long answer. My worms always died. I really don't want to try that again, and I'm worried that worms will die when it goes down to 0F like it seems to routinely do here in the winter. (If I can manage to keep them alive in the first place, which I don't believe I can.)

@donschoe, I checked out that question before posting mine. It doesn't address the questions that I'm asking here.

Coffee stain removal would also be good to know! :-D