Fencing the Atmosphere?

I find it interesting (and sad) that humans will likely show more concern towards the natural environment, out of necessity for survival, before humans show more consideration towards each other because of prejudicial attitudes toward sex, race, religion, etc.

Quote from Terry Anderson/Donald Leal: "If free market environmentalism solutions spark the imagination of environmental entrepreneurs, technological progress toward fencing the atmosphere may be accelerated." --They can't be serious. Why? To hope environmental organizations will purchase the entire atmosphere, so to eliminate the pollution of it? And how? Is it even possible to mark and divide portions of the atmosphere? And the entire atmosphere would have to be purchased from the beginning of it being available on the market from environmentalists; because if say half was owned by environmentalists, and half was owned by corporations which pollute, the pollution would surely move from one portion of the atmosphere to another with wind currents. And it certainly isn't possible to construct physical walls (fences?) to ensure pollutants don't travel into someone's elses property. (Which brings me to a thought: pollutants travel quite far from their source into areas that are privately owned. Shouldn't these polluters be held responsible for that?). Perhaps I am misunderstanding what Anderson/Leal mean by fencing the atmosphere and my response is only good for some laughs. But if that is not what they mean, what do they mean when talking about fencing the atmosphere?