Just The Facts : How much oxygen trees give us

We all know trees provide oxygen for us so that we can stay alive.  I don't know about you, but I think being alive is pretty great.  It allows me to do a lot of things.  I see some folks on The Walking Dead who are no longer alive, and I feel like my daily routine is probably a lot more fun that theirs is.  I can walk around a fence or step over a log, where they might just walk into the fence or trip over the log.  Whether you're a human being, or a zombie that used to be one, you might be interested to know how much oxygen is provided from our tall, leafy green friends..