We're killing air

I love the perspective of the world that kids have through their eyes, so simple and pure. Here's a conversation I had with my son this morning on the way to school:

me: "Don't break that!"

Tyler: "Why not?"

me: "Um, well it's polystyrene"

Tyler: "But, why not?"

me: "Because it will break into little pieces and they don't bio-degrade, um, they never go away"

Tyler: "Yeah, but why not?"

me: "It's bad for the environment and we need it to live"

Tyler: "What's the environment?"

me: "You know, trees and plants and the air in the sky and stuff."

Tyler: "Trees make air!"

me: "Yes, they do"

Tyler: "Trees make paper too!"

me: (laughs) "Actually they don't make paper, we cut them down and make them into paper"

Tyler: "You mean mean we kill trees to make paper?"

me: "Yes we do actually, it's a big problem"

Tyler: "But we're killing air!!!"