Business Green: Logistics and delivery giant FedEx has announced plans to reduce carbon dioxide emissions from its aircraft fleet by 20 per cent and improve the fuel efficiency of its vehicle fleet by 20 per cent. The company said this week that it had already reduced aircraft carbon dioxide emissions by 3.7 per cent per available ton mile over the past three years and improved vehicle fuel efficiency by 13.7 percent, but was now looking to accelerate efforts to cut its carbon footprint. Chief …