Says Planet Green: “Scoop up your doggie doo in biodegradable poop bags so your buddy’s No. 2 isn’t immortalized in a plastic bag, while deep-sixed in a landfill somewhere for hundreds of years.” And for cats, Planet Green recommends this: “Owners should avoid clumping clay litter at all costs. Not only is clay strip-mined (bad for the planet), but the clay sediment is also permeated with carcinogenic silica dust that can coat little kitty lungs (bad for the cat). Plus, the sodium bentonite that acts as the clumping agent can poison your cat through chronic ingestion through their fastidious need to groom.”