Annoyed by the useless junk mail that arrives at your home? You’re not alone. About 44% of junk mail ends up in landfills without even being opened. It is hard to convince the senders of junk mail to stop because, although it may be bad for the environment, it is cost-effective for the companies, even though in a typical junk mail campaign a 2% response is considered a success. According to Forest Ethics, the amount of greenhouse gases created each year by the production of junk mail is the equivalent of the greenhouse gases created by 9,372,000 cars or 85,000 international flights of a 747-400.