LONDON (Reuters) - BHP , the biggest listed miner, aims to decide early next year who has won a tender for LNG-fuelLed transport to ship up to 27 million tonnes, or about 10%, of its iron ore to cut emissions by around a quarter, a senior executive said.Miners are under pressure to become less polluting as society worries about the environment and investors increasingly regard a compelling sustainability strategy as an indication that a company is well-run.BHP says it has a responsibility to..