I print them too! I feel sorry for the trees and for PassAndroid. I mitigate this way:
reusing the paper (e.g. writing my travel plans, things to do, etc in the back)
installing and testing PassAndroid, even when I still bring my printed passes with me. Occassionally, sending translation updates to the app. And of course recommending it for the people that would use an app anyways…
AJ Jordan likes this.