2. Overview

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Background: The Harvesting and Burying Of All Air's Excess Climate Changing CO2
It's not the CO2 emissions we are making today that's causing the Global Warming we are experiencing today.
After the Paris Decarbonization phase is completed around 2050, the next phase of the Climate Change stopping campaign will be the
Direct Air CO2 capture removal of the 500 billion ton legacy cloud of CO2 that will still be remaining in the air.
After that is completed, it may take an additional 100 to 1,000 years for Planet Earth to recover somewhat from the ravages of Climate Change.
This page was inspired by the Modern Marvels video: Harvesting Technology Feeds the World (S11, E49) | Full Episode | History https://www.youtube.com/watch?v=KebnHpNXV0k

Climate Changing Air Contaminants Mix KEEPING YOUR EYES ON THE PRIZE Storing The CO2 Underground Forever Everywhere

(Previous literature focuses primarily on carbon dioxide removal, but additional CO2 removal in lieu of methane removal may be an important complement to future efforts.
Methane removal has at least two key benefits: reducing temperature more rapidly than carbon dioxide removal and improving air quality by reducing surface ozone concentration. 1.906.01)

These are currently commercialized prototype technologies for removing much of the legacy 500 Billion Tons of CO2 from the air that's causing the Climate Change you are feeling today.

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A New, More Promising, Direct Air Capturing of CO2 Using Magnesium Carbonate Mineral Pebbles for
the Capturing and Harvesting of Air's Carbon Dioxide (CO2)
https://www.heirloomcarbon.com/#product-intro

This website discusses the SCALING UP of a scientific paper proposal that has the potential of restoring Planet Earth's original 280 ppm CO2 Level Quickly
(DISCLAIMER NOTE: While this website has absolutely nothing to do with any of the other people involved with weathering of magnesium oxide technology, all rights to detail changes from the original published paper appearing on this website belong to the original authors. - JPH)

This Website's Major Direct Air CO2 Capturing Farm constraints include:
1, Building near a large source of cheap magnesium oxide.
2, Building over geostrata acceptable for massive CO2 disposal via Class VI disposal wells.
3, Building where it almost never snows.
4, Building on flat waste land that does not compete for human food.

To capture and sequester all the CO2 mankind is dumping into the air in near real-time, we could be talking a total of 90,000 square miles (about the area of Minnesota) covered with a 4 inch thick layer of magnesite, perhaps divided into 11 to 1,000 CO2 capture farms in bad lands spread around the world.

"We show this process could cost approximately $46–159 tCO₂⁻¹ net removed from the atmosphere, considering grid and solar electricity without post-processing costs*. This technology may achieve lower costs than projections for more extensively engineered Direct Air Capture methods. It has the scalable potential to remove at least 2–3 GtCO₂ year⁻¹, [per installation] and may make a meaningful contribution to mitigating climate change,"

*(This approach does not drain energy from biomass or any other renewable energy source. Remote installations could easily and inexpensively be powered by carbon captured natural gas generators or micro nuclear reactors.)
(This website's suggested 11 - 3 Giga-tonne CO2 capture (DAC) farms project scales up the cited published study of a 1 to 3 Gt CO2 capture station. This will enable the world to sequester an amount of CO2 equal to almost ALL fresh fossil CO2 emissions being made everywhere in the world.)
(As current fossil CO2 emissions disappear or are rendered carbon-neutral thru this decarbonization project, the spare capacity of these project sites will begin to capture and sequester the world's remaining legacy 500 billion ton cloud of CO2, eventually taking the world from it's current 420 ppm of CO2 back to it's original 280 ppm of CO2 over a period of perhaps 50 years.)

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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 it’s 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.

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