Unfresh Air

Nobody says “Go outside for some fresh air” anymore. We’ve pumped so much crap into the sky, nobody can breathe without a filter bubble or a set of tanks.
A few other things have changed. Tunnels, domes, and electric vehicles. Also lots of genetically-engineered plants people hope will eat up all the chemicals in the air.
It’s not working. The air just gets worse and worse.
They could have put Wrigley Field under a dome, but the Cubs decided to just tear it down and build a new ballpark.
First year in it, they win the World Series.
Who knew?