Number 2 — Kitty litter made of pine, wheat or other plant materials is more sustainable than clay litters. Also, choose cardboard litter containers over plastic.
Kitty litter, especially for cat owners whose cats are soley indoor cats, is important to keep odors away.
Choosing a sustainable litter can be tricky because of packaging. But take your eco-friendly victories where you can. Most litters are made with bentonite clay which is mined and can be very environmentally unfriendly. Clay based litters do not biodegrade so they do nothing to help the environment as they sit in landfills.
Choosing a kitty litter made with corn, wheat or wood is more environmentally advantaegous and if you put that litter in a compostable bag, you can throw the whole thing in the compost heap for non-food producing plants.
Okocat is a natural wood and clumping litter and comes in a cardboard box—with a plastic bag inside. Again, take your victories where you can.