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To a person standing on the ground, our air seems to go on forever. [The sky looks so big, and people haven't worried about what they put into the air.][[THAT SENTENCED WAS MARKED WITH A STET SYMBOL]]From space, though, it's obvious how little air there really is. Nothing vanishes "into thin air." The gases that we're sending into the air are piling up in our atmosphere. And that's changing Earth's life support system in ways that could change our planet forever.