Take a deep breath. You're lucky to be able to. Without a handy blanket of atmosphere gases to swaddle us all, we'd be no more than a twinkle in evolution's eye. But that wonderful blanket of gas is slowly escaping, molecule by molecule, and there's not much we can do about it.
As MinuteEarth explains, the process is very slow, and chances are we'll be long gone before its ever complete. But someday, our blue-green wonderland will probably be just another barren rock like its neighbour, Mars. So enjoy this whole life thing while it lasts. Happy Saturday! [MinuteEarth]