Australian researchers say they have developed a highly efficient way to recycle car and truck tires to produce a rubber composite that could be used in shoe soles, car components, building products, coatings, sealants, and containers for hazardous waste. The researchers at Australia’s Commonwealth Scientific and Industrial Research Organization say their discovery could help deal with growing mountains of used tires. Worldwide, nearly 700 million new tires are produced each year, and nearly all of them are stockpiled, buried, or burned when they wear out.