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Scrap tires are an eyesore, a fire hazard, and a breeding ground for mosquitos. 2 to 3 billion tires currently litter the ladnscape and another 250 million tires are added to the inventory every year. One possible solution for this environmental nusiance has been put forth by Ash Grove Cement Co., Overland Park, Kan. Ash Grove has patented a method of using scrap tires as fuel for cement kilns. Eric Hansen, vice president and technical director of Ash Gorve, makes the following points about the beneficial features of tire-derived fuel: tires are rich in energy--they produce 15,000 Btus per pound compared to 12,000 Btus produced by coal; tires burn cleanly--emission data from Ash Grove's three plants show reduced levels of pollutants as opposed to levels found with coal; tires are delivered by reputable dealers and stored under cover--Ash Grove buys tires from two licensed and experienced suppliers, and they are stored in trailers until they are used; tires have more value than coal--suppliers pay Ash Grove to get rid of tires, offsetting the cost of the equipment and manpower used to run the operation and resulting in savings on coal bills; public support in local communities has been mostly positive--local and state officials strongly support Ash Grove's plans, and Idaho state officials underwrote part of the company's initial investment; tires conserve energy--for every pound of tires Ash Grove burns, the company saves pound and a quarter of coal.