Unfortunately, vacuum cleaners are not very selective. They will suck up N2, O2, CO2 and everything else. The other problem is that they squirt it straight out after filtering any dirt particles larger than a certain size. Even if you could capture what was sucked in it would not alter the ratio of CO2 to everything else. That would remain the same. Apart from that, it sounds like a good idea.
You could if it was properly sealed. But if you're using it to clean your house, then you have to empty it again.
I sucks that up along with excess O and N
no, because it will just exit the vaccum since it is not air tight. also, air is mixed with co2 and you wouldn't be able to separate the two.
That's awfully silly! That's like the broad that wants to use a really big air conditioner to solve global warming.
