"Rethinking Possible"

I wonder, if we could actually build a giant filter, or multiple big filters that can absorb "what we call bad air" and blow out "what we call good air." Is that a possible innovation somewhere in the near future? An invention that can vastly improve air quality? Just the thought of it makes it seem like the ultimate resolution to the global warming problem. These inventions would be
placed near heavily polluted areas: places such as seaports, airports, refineries, industrial sites, and business districts. And as pollutants are put into the air, the air is sucked into this filter. There it gets cleaned and pushed out back into the world.

I once asked this question before, and the answer I got was "where would these absorbed pollutants filters go?" Well if a football team can build a 1.3 billion dollar stadium and a corporation can build a collection of buildings at 700 million dollars a piece, why can't anyone one build a large facility that host vast numbers of trees and gardens? A place where these absorbed pollutants can be placed and taken care if. Is this just an idea from my wild imagination or are people really just not trying as hard? If this idea doesn't seem possible, it's time to rethink possible.

Stephen Vance