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                                          1. Harvesting Climate Changing CO2 - - - 2. Overview - - - 3. The Scientific Basis - - - 4. The CO2 Harvesting System Technology - - -  5. CO2 Disposal Well Technology 

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A Chemical Absorption Process That Can:  1. Remove CO2 Out Of The Air Using Magnesium Oxide Rocks,
2. The CO2 can then be liquefied,  3. mixed with "CarbFix",  4. injected into the ground,  5. where it will become solid limestone locked in the ground forever.

"Ambient weathering of magnesium oxide for CO2 removal from air".
By: Noah McQueen, Peter Kelemen, Greg Dipple, Phil Renforth, & Jennifer Wilcox.
Link:  https://www.nature.com/articles/s41467-020-16510-3
 (The above paper goes into great detail about the basic ideas and chemistry studies related to this idea. Many excellent tables breaking down estimated costs. Please visit and download your own free pdf Creative Commons copy of this paper for your personal understanding and reference.)
The website author is an industrial control system engineer. There may be a half-dozen such chemical processes that could be used to suck CO2 out of the air using similar machinery. The cited paper appears to be extremely well thought out.

The Technical Paper's Basic Concept Sketch

(A Calciner is an air-tight oven.)

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The Basic Concept Sketch (shown above) With Major Supporting Processing Machinery Added

 

About the https://feeco.com/rotary-calciners/        (Please Visit)  

  About the The Class VI CO2 Disposal Well    (Please Visit)

About CarbFix: Locking CO2 in the ground forever. Watch:     https://www.carbfix.com/   (Skip the ad someone inserted in front of the video.)
If water is added to the liquid CO2 as it is pumped into the ground, the CO2 will turn into limestone [carbonate] after a few years. This locks the CO2 underground forever.

Above: The site's author added some engineering details to show what might be done to/with the magnesite if it were used in the context of this website.

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Direct Air CO2 Capturing (DAC) Pebble Farms have the potential to quickly restore the world to it's original 280 ppm CO2 level.
It is possible for Planet Earth to have hundreds of small Direct Air CO2 Capture farms all over the world that, along with decarbonization, could completely halt Climate Change.  (Click to Enlarge.)

Climate-Changing CO2 can be captured from the air (see below), liquefied, mixed with 'CarbFix', then pumped into permanent underground storage strata all over the world to become limestone.

"To meet our climate goals, 10 billion metric tons (referred to as tonnes from herein) per year (GtCO2yr−1 ) must be removed globally by 2050. After 2050 and thereafter, 20 GtCO2 yr−1 must be removed [2]. These reductions do not include emissions avoided by decarbonization, rather CO2 directly removed from the atmosphere." - Noah McQueen, "A review of direct air capture (DAC): scaling up commercial technologies and innovating for the future". 16 April 2021.

The above is Climate Change mitigation orthodoxy. What follows is what might be possible if the IPCC followed a path of maintaining the climate's health that resembled what the medical world does for human health - isolation and containment.

What is being proposed below are sewage-like CO2 treatment plants for the air for removing and isolating the excessive amounts of the toxic air contaminant carbon dioxide in the air. Carbon dioxide emitted into the air from anywhere on Earth wafts around the planet, so the gas can be captured and disposed of wherever itís convenient. Wind-circulated gas diffusion will quickly sweep excess amounts of CO2 created anywhere in the world's air to any location on the surface of the earth that is causing reduced diffused carbon dioxide gas pressure by removing local carbon dioxide from the air - i.e., a virtual CO2 'funnel'.  U.S. 'Class VI' CO2 disposal wells (or equals) at that location, in combination with the liquefied CO2 additive "CarbFix", will safely turn this CO2 that has been injected deep into the earth into limestone. This will lock the air's captured CO2 very deep underground forever.

Roughly speaking, the above 12 billion tons of available magnesite limits the world to extracting 12 billion tons or so of Non-Biomass carbon dioxide (CO2) from the atmosphere each year.
Possibly a more frequent harvesting interval is possible, say, 3 times per year to yield 36 billion tons of CO2 per year?
Also, since magnesite deposits and CO2 disposal strata are spread around the world in many different countries in varying amounts, breaking apart the Direct Air CO2 Capture industry to reflect these circumstances might prove more efficient.
Most importantly, once the task of reversing Climate Change has been achieved, the world will still face the task of also removing that invisible cloud of about 500 billion tons of CO2 still hanging over us before Planet Earth becomes cool again.

https://investingnews.com/daily/resource-investing/critical-metals-investing/magnesium-investing/top-magnesite-producing-countries/ 

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