The most famous carbon dioxide absorber

You'd only need a few hundred grams of triethanolamine if you regenerate it several times a day (with a vent to outdoors), but there are probably some spill risks and maybe mist. Soda-lime is cheaper but requires inconveniently high temperatures to regenerate, which probably result in unwanted emissions requiring mitigation as well as too much energy use. Regular lime (without the soda) avoids the emissions but takes a month to absorb the carbon dioxide. Alkali-metal oxides, hydroxides, and peroxides like those discussed in the article are extremely compact and fast-acting but even more difficult to regenerate. Bioreactors with spirulina or chlorella have been tested successfully but require hundreds of kilograms of algae per person and are finicky, being prone to infection. I think it's eminently possible at a technical level, but at a political level, basically you can only do this kind of experimentation if you live in China.

An actually physically feasible thing you can do is to whitewash some walls. You need to apply about 7kg of whitewash per person per week, so you are going to need a lot of walls, on the order of 400 square meters of wall per person, because the whitewash is regular lime, not soda lime. (If you're daring enough to dope your whitewash with lye, maybe you can get by with less wall area, but you still need to keep applying the whitewash at 7kg per person per week.) You can make them out of plywood, sheetrock, sheet metal, old sheets, whatever whitewash will stick to. After a few months you will need to start throwing out 14kg of fully cured whitewash per person per week, or calcining it to make fresh whitewash. Try to get whitewash with as little chalk in it as possible.

At this small scale, dozens of kilograms per week, you might be able to calcine the used whitewash in a pottery kiln on your patio. Beware that electric kilns generally do not handle reducing atmospheres well. I'm not sure if carbon dioxide would be too much for them. I think it should be fine, but don't blame me if you ruin your Kanthal.

The average human exhales about 1 kilogram of carbon dioxide on an average day. Carbon makes up 27.3% of that: ~300 grams. That's the weight of a smartphone.

The logistics would be complicated, average plants aren't going to be accumulating so much mass so quickly. You would need aquariums full of algae. Just isn't worth it.

Not sure what city you live in but in the big cities I’ve lived in it was always easy to get the level down to 500ppm by opening windows.

Probably way more important than lowering the CO2 is getting rid of PM2.5/PM10.

Rooftops nowadays are best used to mount solar panels. Some system growing circulating algae, be it on the roof or on the sun drenched walls while doable would have way higher at least the operating costs. Clining is one thing. If you live in the area with below zero temperatures either you drain the system or invest even more in some glasshouse, maybe thermal isolation at night or heating.

As mentioned by others, there are chemical solutions.

I think measuring CO2 is mostly only useful as a proxy for how well you are ventilating (which is correlated to the health of your air unless outside air is filled with ie small particles or smog), and when you measure 800 ppm it is more than adequate. 800 is not doing anything to the body (that we know of).

Do you want to use chemicals and devices that make the climate problem worse just to lower the CO2 concentration in your personal space? Sure it’s a small effect but not something we can all do.

A HRV or ERV, depending on how humid it is where you live will help immensely. Unfortunately hard to retrofit into existing construction.

Hah! Glad someone else wants to try this!

The scenes where they identify the square peg/round hole problem and where John Aaron and Ken Mattingly get the power draw down are some of my favorite in any movie. Must watch for any engineer

That would be one helluva parachute.

So... like... it's tough, generally works, and doesn't show you ads. Sign me up!

I watched the moon landing as a young kid. On our rich neighbors TV. We didn't have one. I do hope that live to see another one. Not sure as they keep delaying it.

Which, apparently, nobody knows how to replicate today.

Myself, I was thinking https://en.wikipedia.org/wiki/General_Sherman_(tree) .

I was thinking ‘Amazon rainforest’ or perhaps ‘ocean’

The triumph of the movie, as described at the time, was making people care about a story they already knew the ending to. Opie sure turned out good.

Also for anyone interested, some of Flight Director Gene Kranz's recordings are available online. Here's the first part: https://www.youtube.com/watch?v=KWfnY9cRXO4

The comments have time stamps for some particularly interesting moments, but the incident occurs 8 minutes in, and the infamous "Houston, we've had a problem" remark happens at 9:20.

The blog post talked about how everything had to be communicated verbally because you could not share images, but since we're so used to Hollywood adaptions or documentaries, I find the recordings really drive the point home.

There was never any requirement for sharing anything between the two vehicles and they were made by completely different contractors. Grumman made the LEM and North American Aviation made the command module. There was also a significant redesign of the command module after the Apollo 1 fire which completely changed the cabin environment. Sort of how you probably cannot take a chunk of equipment out of the cockpit of an Airbus 320 and expect to slot it in to a similar role in a Boeing 737.

I believe Neil Armstrong said that is the correct quote, it just dropped the "a" in the transmission.

To be fair, they did not say they were remembered correctly.

No. Local time for the vehicle was 14:13. Local time for mission control was 13:13.