But you are using additional electricity that your phone uses for the extra time swiping and tapping to open and keep that mobile boarding pass displayed, not to mention all of the extra electrons that have to fly through the internet (you would think Al Gore would have made the internet more carbon neutral when he invented it). That means your phone ends up making the power plants work harder, which are quite likely are burning fossil fuels. You better hug two trees and a shrubbery on your way to the airport to be sure you are offsetting your emissions.