When I have my art printed, I can have it printed on Forest Stewardship Council Certified paper, and shipped with no or minimal plastics.
But the option to specify that the item IS in that category is not being offered. Perhaps it didn't occur to Etsy that is a possiblity?
I don't know how else to report this, I hope it can get to the right team.
The sustainability Attribute is only showing in certain categories for now.
I suspect that Etsy is waiting to see what effect this will have on sales and also possibly how much abuse of the attributes there will be (ala resellers marking items as handmade) before they expand the program.