Brazil's government approved taxing ethanol imports for the first time in a move to protect local producers from growing shipments coming from the United States.Brazil's Agriculture Ministry said the country's foreign trade chamber, known as Camex, approved a 20-percent tax on ethanol imports, which would be levied only after a tax-free quota of 600 million liters per year is surpassed.Brazilian ethanol imports reached 1.29 billion liters in the first half of the year alone, a 330 percent increase compared to the same period a year earlier.The move ends an agreement between the world's two largest ethanol producers, Brazil and the United States, to keep global ethanol trade free of taxes to boost the industry.