The paper can be used as grease proof baking paper, burnt in the fire or composted.
This site makes some good points as to the advantages of butter over margarine. They compare the ingredients used in each;
Butter – cream, salt
Margarine – Liquid Canola Oil, Water, Partially Hydrogenated Soybean Oil, Plant Stanol Esters, Salt, Emulsifiers, (Vegetable Mono- and Diglycerides, Soy Lecithin), Hydrogenated Soybean Oil, Potassium Sorbate, Citric Acid and Calcium Disodium EDTA to Preserve Freshness, Artificial Flavor, DL-alpha-Tocopheryl Acetate, Vitamin A Palmitate, Colored with Beta Carotene.
Hmm………makes you think ay.