I once had friends visit and I nearly fainted: it was a mother with her teen son. He asked for a sheet of paper and I, being polite, brought him a whole stack I had left since high-school. He started drawing, and that's how:
he drew a line, it didn't please him, he crumbled it and threw to the garbage (not the one for paper only - the regular one), and so on he wasted 10 sheets when I said "What are you doing? Why are you tossing paper?"
'What, are you greedy?'
'No, but you're not even using it - just tossing! And you could at least throw it to the proper can...'
His mother got angry and protective:
'You are not well-mannered, Sophia!'
So after my tiny attempt to save the stack I listened to an hour-long bragging of how much oil their car drinks and how proud they are to be rich and able to drive it all day, and how ridiculous those green-peace people look - who gives a damn about tigers and elephants?

All I could do was not talk to them again, ever...
Though I still hear complaints to my mom about "that one time you daughter was too greedy to let my boy draw on her paper"

You know, I am tiny, and 10 sheets of paper don't mean much, except if multiplied by every moron that lives on our mother-Earth...