Sponges aren’t that green. Basically you’ve got three choices:

Typical cheap sponges made with toxic and non-renewable polyurethane. These sponges won’t biodegrade and will last and last in a landfill.
Animal derived sea sponges which some people have an issue with because they are living at one point and some don’t.
Sponges made from wood pulp cellulose. These will biodegrade, and are non-toxic, but some say they encourage logging because they’re made with tree pulp. However, they’re a better choice than polyurethane sponges.

There are better choices:
I used to buy wood cellulose sponges when I did buy a sponge (rarely) and now I haven’t …read more