[i2cmaster]

I don't see how these are improvements over algae bioreactors. Capturing the CO2 without reducing it will lead to less oxygen in the atmosphere as well. Also at least with bioreactors you get useful products/energy. This just generates more waste products and consumes energy.

[mchannon]

Removing ALL the CO2 in the atmosphere would be 1-2% the partial pressure of O2 in the atmosphere (barometric pressure where you live swings more than that). Of all the concerns, this one’s low on the list.

[i2cmaster]

The justification for these things is that the oxygen is being converted to CO2 faster than CO2 is being reduced back to oxygen. So if you capture CO2 at a high rate eventually this would lead to you capturing all of the oxygen.

[mchannon]

We’ll run out of CO2 through the natural version of this process (weathering) long before the O2 encounters this problem. At that point all the plants die, still with plenty of O2 in the air.

In other words, it’s the carbon content that’s more endangered over the next billion years than the oxygen.

The problem with this technology isn’t side effects like this, it’s prohibitive power requirements.