413ppm is now ambient. Goes up higher every year (with a small amount of seasonal variation).

By 2100, we may be at 800ppm if we continue and/or accelerate fossil burning (4 degrees C trajectory). https://www.co2.earth/2100-projections

Already a middling stuffy room, and would increase indoor levels 400ppm over today.

I wonder at what point will people have active systems to lower their CO2 below ambient in their homes.

You mean plants?

You need an enormous, full sun greenhouse just for one person’s CO2:

“An active person exhales about 1 kg of CO2 per day. So, you would need 1000 square meters of grass to absorb one person's CO2. That's a square about 32 meters on a side, or in archaic units, a quarter acre. A one-square-kilometer park could support 1000 people, just with the grass.“

(Or: Need about 16 trees per person.)

http://highfrontier.com/forum/showthread.php?tid=20

ha, i actually bought a bunch of plants from the nasa list a year-ish ago to help reduce co2 & voc levels: https://www.healthyandnaturalworld.com/best-air-filtering-ho...

Did you notice a difference? We have a small office with two people, multiple PCs, printer, etc. It gets warm and stuffy regardless of the season and climate control, and I have trouble focusing especially in the afternoon.

I'm thinking of picking up a plant or two and pointing a fan at the door to send out some of the stale air.

To get a better filtration effect you need to force air into the root zone through an active carbon layer in the soil media. That is the method used in the original nasa paper and subsequent public labs designs when trying to remove VOC's such as those emitted by printers. Active carbon adsorbs the VOC's so that the root microbes can metabolize it. Since it is a microbial filter, it becomes more effective at filtering the contaminants that it's most exposed to. Active carbon can also remove CO2, but must be recharged with lower CO2 air periodically.

The public labs design uses a aquarium bubbler to push the air, but the flows are pretty low - with retention time in my 10x12 office at 1 month. Since the VOC's are usually heavier than air, if you place the pump inlet on the floor it performs better though.

i felt a little better but honestly i think it was more placebo than anything. i didn’t have the IAQ monitor before getting the plants so i can’t know for sure what the air quality effects were.

i got 6 plants (but 1 died) and they make my living space feel more lush and comfortable, which i count as a win.

i did also eventually get a air purifier (blueair 211+) and that’s probably the main workhorse at night with the doors and windows closed (which is when i need it the most). i noticed a clear drop in allergy/asthma symptoms (sneezing, coughing, headaches sometimes) after getting the air purifier.

so a fan at the door will probably have the best bang for the buck for you, but plants are nice too. =)