That Guy
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Don't compare US to Canada. While the police DO have their own facilities, they also use regular gas stations as well, not just for gas, but to visit on breaks, to get coffee or snacks as well.Police stations have their own pumps. They never fill up at commercial gas stations.
Again, your opinion is unwanted.
As for CO2, here is something I found, that explains it better than I ever could.
"CO2 is inert (as far as human breathing is concerned) = it does not react chemically in our lungs.
Unfortunately for us, we DO need something that reacts... molecular oxygen.
Breathing CO2 is the same as not breathing at all (you lungs get filled with something that does not contribute anything you need). Same as "holding your breath", you can continue to exist (and even work a bit) for a few seconds - or even a bit more than a minute if you were trained for it - but eventually you would pass out from the lack of breathing.
CO (carbon MONOxide) is poisonous: it would actually rob your lungs of whatever loose oxygen they still contain and they would enter the bloodstream and then steal any free oxygen that is still around). It does not take much CO to poison us. That is why people do die from carbon monoxide poisoning, even though there is also some oxygen in the air they breathe. The CO actually does nasty stuff.
The CO2 just takes up the place that oxygen would have taken, thereby robbing you of oxygen.
Plants do convert CO2 and H2O into oxygen (and sugar), as long as they are provided UV light (to kick-start the chlorophyl reaction) and the rest of the conditions are OK. However, they do not "scrub" the air (they don't clear out the CO2, they just take some of it) and they don't guarantee that the liberated oxygen won't be taken up by other reactions (like rusting any iron around).
The advantage of using plants is that they will also give you food... eventually (it is a slow process).
For human breathing in enclosed spaces, you are better off with chemical "scrubbers", usually made of highly oxygenated molecules that release their excess oxygen when in contact with water and CO2,"
-Raymond