If plastic bags in your home are tearing you up with guilty knives and sharp teeth, just pot plants inside them. At flower shows in Bangalore I often find sellers of garden equipment and plants offering all kinds of gorgeous flowers, ferns, succulents, cacti and other treats that they have grown inside small plastic bags! This makes them very cheap and also makes you feel very green for buying them!
Even the men who come to the gates with carts selling plants often have them inside plastic bags. All you have to do is shift them onto your pots.
One of my cats, a tortoise shell, loves plastic bags so much I think she has plans to kill the planet like the Trumpet! But of late luckily she has shifted to sitting on books which is much better.