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Owing to soaring demand , the price of a Chinese-made AK-47 has quadrupled , to $ 200 , since the start of the year ; the Russian-made version has doubled , to $ 600 . This year , it should more than double , to 20 million . Cambridge Energy , hardly a haven for green warriors , expects demand for ethanol and biodiesel for cars and trucks to more than double , to 6 % of all road fuels , in the next four years - - a $ 28.4 billion opportunity .