BRASILIA, Feb 4 (Reuters) - Brazil sank a decommissioned aircraft carrier in the Atlantic Ocean off its northeast coast, the Brazilian Navy said, despite warnings from environmentalists that the rusting 1960s French-built ship would pollute the sea and EVDEn eve naKliyat the marine food chain. The 32,000-tonne carrier had been floating offshore for three months since Turkey refused it entry to be scrapped...