In my series of "Totally Not Sustainable", (which if you have not seen I don't recommend getting to into because they are totally not sustainable, the "show" has no chance of lasting) I talk a bit about why boarding passes are not sustainable. You would think it's obvious, they're made out of paper, thus killing trees, etc. 

 But let's get serious people, you can recycle paper, and turn that recycled paper into a paper tree that you could then plant, let it grow for a few years, and cut it down for more paper later. The reason why Boarding passes are not sustainable is because their functionality is so limited. Until they make the buttons clickable on boarding passes, they will continue to be a waste.

Totally Not Sustainable: Boarding PassThe button Totally doesn’t work. I tried.