Business Green: BusinessGreen.com: As vice president technology and environment at one of the world’s largest developers of aviation engines, you must be well used to the charge that the sector is environmentally unsustainable and has not done enough to cut carbon emissions Dr Alan H Epstein: It’s true that aviation was the bad boy of the environment, but it now has one of the most coherent approaches to environmental issues. From the companies such as Pratt and Witney that make the equipment, to …