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The pen would begin degrading after a sensor or trigger detects an empty cartridge. The same principle could be applied to other desposible plastic utensils, like plasticware for eating - except the utensils would degrade after being used for a meal. In a long shot, old electronics and household appliances could be made out of biodegradable materials that could start break down. By setting off a sensor or trigger somewhere inside the device (accessible by opening a lid) to begin the process of vaporizing/biodegradation. A person would have to throw away or put the device, cartridge or utensil into a compost pile.