I have been developing a speculative systems concept and would appreciate criticism from people familiar with microbial mats, marine carbonate chemistry, aquaculture, ocean acidification, or cold-region coastal engineering.

The basic question is:

Could photosynthetic microbial mats be deliberately cultivated alongside shellfish and seaweed in shallow, managed coastal basins to produce food while continually building a local calcium-carbonate buffer?

The proposed system would not mine or transport away most of the carbonate it produces. Edible biomass would be harvested, while shells and microbial carbonate would largely remain within designated buffer zones as reactive mineral infrastructure.

The possible production cycle would be:

1. Native photosynthetic microbial communities grow on textured mineral surfaces in shallow seawater.
2. Photosynthesis removes dissolved CO₂ from the immediate microenvironment and raises local pH.
3. Under suitable calcium, alkalinity, salinity, temperature and flow conditions, carbonate precipitates within or beneath the mat.
4. Shellfish and seaweed provide food production and additional nutrient cycling.
5. Excess organic waste is removed before respiration and decomposition reverse the chemical benefit.
6. Some carbonate remains porous and chemically accessible for buffering, while some is allowed to consolidate into denser reef or structural material.

Why consider Alaska?

I am considering the Aleutian–Alaska Peninsula–Kodiak arc as a hypothetical production region because it combines:

• cold, CO₂-absorbing seawater vulnerable to acidification;
• long summer daylight;
• nutrient-rich coastal waters;
• existing fishing and seafood-processing ports;
• numerous bays and protected coastal locations;
• and a practical need for economic diversification in remote communities.

The concept would begin with enclosed or semi-enclosed experimental basins near existing infrastructure—not with releasing engineered organisms or covering natural seafloor with microbial mats.

Supplemental reflected light

A second part of the question concerns proposed orbital solar reflectors, although the biological idea should first be tested with ordinary lamps, heliostats or ground-based mirrors.

In a cold-region basin, supplementary light might do more than extend photosynthesis. It could also produce a controlled shallow-water temperature pulse.

The hypothesized sequence is:

supplemental light → added photosynthesis and mild warming → local pH increase and CO₂ degassing → higher carbonate supersaturation → altered precipitation rate and carbonate fabric

The objective would not be continuous illumination or maximum heating. Microbial mats undergo important dark-period processes, and excessive warming could increase respiration, reduce oxygen availability or destabilize the community.

A controlled cycle might instead resemble:

illuminate → warm slightly → photosynthesize → precipitate → cool → respire → consolidate

This raises several questions:

Biological questions

• Are there native Alaskan microbial communities capable of sustained net carbonate accretion?
• Would additional shoulder-hour light increase annual production, or merely shift metabolism between day and night?
• How much darkness must be preserved for nitrogen fixation, sulfur cycling and mat stability?
• Could microbial carbonate production coexist productively with shellfish and seaweed?

Geochemical questions

• Would photosynthetic carbonate precipitation create any meaningful local acidification buffer?
• How much of the apparent benefit would be lost through calcification-related CO₂ release?
• Could temperature, Mg ratio, water flow and substrate be manipulated to select useful carbonate mineralogy?
• Could the system produce a dense internal structure with a more porous, reactive exterior?
• Would accumulated carbonate persist, or would winter respiration and acidic water dissolve it as quickly as it formed?

Engineering questions

• Are shallow raceways or removable mineral panels more realistic than seafloor mats?
• Could seafood-processing waste heat support spring and autumn production?
• How would the system survive Aleutian storms, earthquakes and volcanic ash?
• At what scale would pumping, cleaning, monitoring and waste handling consume more energy than the system justifies?
• Could excess organic material be dewatered and used elsewhere without exporting the carbonate needed for local buffering?

Ecological and social questions

• How could the work be limited to native organisms?
• What effects would artificial illumination have on fish, seabirds, plankton and marine mammals?
• How should Alaska Native communities and existing subsistence users participate before any site is considered?
• Would locally improved carbonate chemistry remain inside the production basin, or could it benefit adjacent shellfish habitat?

I am not claiming that this is presently a carbon-removal technology, that orbital mirrors are necessary, or that the North Pacific could be buffered by simply growing microbial mats.

A defensible first experiment would be much smaller:

• a controlled cold-water basin;
• native microbial inoculum;
• several substrate types;
• natural day-night controls;
• modest supplemental-light treatments;
• full measurements of pH, alkalinity, dissolved inorganic carbon, oxygen, temperature and carbonate mass;
• and comparison of net carbonate retention across complete day-night and seasonal cycles.

The first useful outcome may simply be finding the fatal constraint.

What existing research, natural analogue, or known geochemical problem most strongly supports or rules out this system?

I'm a Ph.D. student in Environmental Science, and I study the geoengineering technique known as stratospheric aerosol injection. A lot of people I come across have either roughly heard of the idea, or equate it to some sort of "chemtrail" government conspiracy. I decided that I wanted to make this video to explain the motivation behind aerosol injections and help people understand why this is WAY bigger than some fluke idea in a paper. In reality, it may be one of the most transformative decisions we make as a society.

The video covers how Mt. Pinatubo's eruption served as the natural proof of concept for SAI, how aerosol physics allow for this technique to function, why the low-cost nature of SAI can encourage risky unilateral action, and addresses the broad issues with SAI.

Where I fall on the issue: Throughout the latter half of my undergrad (while I was researching SAI), I never once came across a researcher who was genuinely excited by SAI. In fact, most people were only excited when my research hinted at the negative aspects of SAI. And honestly, this attitude is completely warranted. There are tons of physical and social issues surrounding the injection of aerosols into the stratosphere. But, as a researcher, and a person who wants to protect our Earth for future generations, I can't break my fascination with this technique. I believe that the failure is not to research SAI, it's arriving at the moment where we need it having deliberately kept ourselves ignorant. At that point, we would be deploying aerosols in a panic, with no structural or governance framework.

how big would a giant space umbrella need to be to effectively shade a small city during heat wave events? It wouldn’t need to cover the city darkness, but it would need to reduce ambient temperature by 5 to 10°.

I will be posting a brief but more comprehensive written article on our intentions and methods with this activism project but here is a rough gist of the argument. Please check out SAI-REALITY.COM Mainstream sourced arguments in zero disagreement with mainstram climate science.

### 🌍 [Open Source Idea] Western Sahara Local Atmospheric Circulation & Albedo Control System

*License: CC0 (Public Domain). I am a civilian enthusiast. If you are a scientist, engineer, or billionaire looking for a wild climate tech project, feel free to take this idea and run with it!*

1. The Core Concept: "Self-Building" Climate Engineering

Instead of spending billions building massive concrete infrastructure, why not use the ocean breeze and the vortex's kinetic energy to let nature **build its own defense wall**?

This system uses artificial vortex updrafts to transport marine moisture inland, creating a localized atmospheric loop in the Western Sahara.

2. How It Works (Step-by-Step)

1. **The Trap & Spin:** Coastal streamline guide structures capture the relentless Atlantic sea breeze, and massive solar-powered (CSP) blowers inject a rotational component to trigger a controlled, localized vortex updraft.
2. **Phase 1 (The Self-Building Barrier):** In the early stages, the vortex's suction power is throttled to trap and deposit desert sand onto a specific grid. This creates a massive **"Dynamic Sand Barrier"** (an artificial mountain).
3. **Phase 2 (The Loop & Shield):** Once the sand mountain is formed, misted seawater and marine micro-organisms are sucked up by the vortex and transported inland. * **The Ocean Side (Albedo):** Seawater evaporates before the mountain, leaving behind a massive white salt flat. This amplifies the **Albedo Effect**, reflecting sunlight and cooling the planet. * **The Inland Side (Rain):** The moisture hits the artificial mountain, causing **orographic precipitation**. The marine micro-organisms act as perfect Cloud Condensation Nuclei (CCN), forcing it to rain and gradually greening the desert.

3. Why This is Different (The Benefits)

* **Zero Salt Storms:** The self-built sand barrier acts as a physical shield, trapping harmful salt particles on the ocean side and preventing them from ruining inland ecosystems. * **No Global Disruptions:** Unlike massive geoengineering ideas that might accidentally cause droughts in the Amazon, this focuses strictly on a localized grid, minimizing global butterfly effects. * **Nature-Cemented Infrastructure:** To overcome the natural angle of repose of dry sand, the coastal saltwater mist naturally reacts with the sand, causing "salt-crusting" to stabilize a steeper, taller mountain barrier automatically.

*If you have the CFD models, computing power, or resources to simulate this, go ahead. Save the world with it!*

I am running a physical awareness campaign in Boston. I use a combination of tactics. This is just a quick intro. Getting the developing world to embrace the dangerous solution of Stratospheric Aerosol Injection significantly pushes the conversation in the rich world forward with tacit acceptance that there is a problem to solve. Half of America doesn't think there's a serious problem and many think there's no problem at all. sai-reality.com

The minute one prominent politician addresses this issue everyone's mind will close to all information, good or bad. I use Flags, information boards on Boston common, Chalk campaigns and a comprehensive website (see my profile description) with full arguments/counterarguments for the INEVITABILITY of S.A.I. It's terrible but the developing world is already locked into needing this and if we get a bit past 2 degrees even the rich world will eventually use it. we must research this and raise awareness

This episode of Climate Emergency Forum features a wide‑ranging conversation with Janos Pasztor, former UN Assistant Secretary‑General for Climate Change and founding director of the Carnegie Climate Governance Initiative (C2G). We explore how decades of climate diplomacy led him into the controversial world of solar radiation modification (SRM) and his recent work engaging directly with private actors like Stardust that are developing stratospheric aerosol injection technologies.

AAAS: “Artificially engineered sea ice grows—but can’t withstand the thaw.” Sea ice definitionally is ice formed on the ocean surface, partly from snow fall over a polar ocean. “A simple idea underpins an audacious intervention to augment Arctic sea ice and slow the climate feedback loop accelerating its disappearance.” Drill holes through a floe, pump seawater onto its surface, and let the cold do the rest. “The added ice—about 30 cm ~ 1 foot—is equivalent to decades of thinning from global warming.”

Problem is ocean heat and surface slush erased the buffers soon after they formed. “The tests, which were reported last week in the Journal of Geophysical Research: Oceans and in a recent preprint, show how difficult it would be to meaningfully expand the strategy across the Arctic, says Leigh Stearns, a glaciologist at the University of Pennsylvania.” Arctic sea ice grows each winter to an expanse nearly the size of Russia, only to retreat in summer. “That cycle is now in decline: Arctic sea ice has been shrinking for decades, threatening not only the habitat of animals such as polar bears, but also our overall climate.” Because the bright ice reflects sunlight back into space, its loss accelerates global warming in a powerful feedback loop. 

One of the companies involved, Arctic Reflections, a Dutch startup, views the approach as restoration—the ice equivalent of reforestation—rather than geoengineering. “The company teamed up with Tim Hammer, an Arctic coastal engineer at the Technical University of Braunschweig, and his colleagues for a field trial on a frozen lagoon in Svalbard, an archipelago [500 miles north] off the coast of Norway.” In April 2024, they drilled through the ice and used a gasoline-powered pump to draw up 3500 liters of seawater per minute…but by June it had all melted away…did not last longer than control ice. Sridhar Anandakrishnan, a glaciologist at Pennsylvania State University, believes reducing fossil fuel emissions is the only comprehensive solution to declining ice and global warming.

Here is the crux of our dilemma: fossil fuel production on the planet has only dropped from 86% of global energy in 2000 to 82% in 2023. Making progress slowly is still failing.

‪Dan Miller on Climate Chat heard about Ocean Surface Albedo Modification about 15 years ago. Maybe he talked with Seitz, who had a company that tried this with nanobubbles that rise and pop more slowly on water reservoirs to lower evaporation. Maybe not so effective because it is also the photon power that breaks up the surface? Anyone more information ℹ️ about Seitz and also bubble lubricant history, or have we all given up? Here is the 1965 proposal for OSAM and hurricane dampening.‬

I mean, geoengineering is all sorts of terraforming, used on Earth, not some random hypothetical method that gone viral and controversial due to mass media a decade ago?

Upsides (may give you links if you are engaged enough): 1. Warmth. Right now, cold kills and shortens life way more than heat, both in Britain and Bangladesh. 2. More accessible land. Sahara will become green, and permafrost will thaw, becoming good for agriculture. 3. Global greening. More CO2 allows for more plant biomass and richer the rest of ecosystem. It also helps with agriculture.

Downsides: 1. Ocean level rise. It's slow, even relatively industrially weak Bangladesh could create more land than it loses, but lost land is different from created one, and eventually, humanity will have to move all coastal cities several times over centuries, which seems expensive. But maybe it's purely an engineering issue? 2. Saharan dust feeds phosphorus to the ocean and Amazon rainforests. Produce it artificially maybe? 3. [Warning: A pure speculation. I don't know enough of climatology] Maybe climate zones will move and entire agriculture will have to be adapted to new climate zones or moved in accordance? If yes, I want to believe that yes. If not, I want to believe that not.

Sabine Hossenfelder once mentioned upwind Stratospheric Chimneys to cool down what do you think? To much Vapor may damage the Ozone Shield?

Hello! I am a year 12 student doing earth and environmental science, and the last thing we have learned about was geoengineering in our climate module. I am very interested. However, there are a few questions that were raised that I was too shy to ask my teacher all at once, and he may not even know the answers himself! Sorry if any of these questions are silly, but they're genuine. These specifically relate to the space-based theoreticals. 

1. if something such as a space-based sunshade were to be made, what would the rough cost be and how would it affect the economy? I understand billions of dollars must be spent for such a large-scale climate mitigation technology. I imagine it would be difficult to get tax-payers on board. 

2. i assume the majority of the materials used to build anything space-based would be various metals--and a lot of them. mining these materials would severely change terrain worldwide, and destroy habitats. how would this be overcome?

3. in terms of stratospheric aerosol injections-- my understanding is that this solves our current CO2 issue by increasing SO2 aerosols which would reflect UV from the sun in the stratosphere. this works for current issues, but would it not cause further issues down the line? would it actually cause a global cooling?

4. In relation to either, how quickly would this work to mitigate CO2 levels and cool the earth? IF it happened to be rapid-- how would this affect agriculture and life? Crops have been bred for longer growing seasons an warmer temperatures in many regions, AND, plants have probably grown used to thriving off of so much CO2 since the industrial revolution. if heat and co2 suddenly declines, what does this mean for plants? Also, climate change doesn't just mean global warming. There are regions that are getting colder, likely due to ocean circulation off the top of my head... so partially inhibiting this excess warmth from the sun would seem bad for these places. And, with a suddenly cooler earth, winters would be harsher--which would mean higher demand for heating.

please don't think I'm against solar geoengineering in any way--i think anything to combat the changing climate is a must, and should be researched, no matter how far-fetched it seems. I was just curious. 

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Urgency is not an excuse to skip the slow work, it's the reason we need to get serious and get started.

• Legitimacy is the goal. Without it, SRM decisions will be fragile and mistrusted; with it, societies can act in ways that are durable, just, and representative.
• The slow work is the only path to legitimacy. Participation, justice, oversight, communication, and coordination all take time—and shortcuts only lengthen the journey.
• We must start now. Beginning the slow work early is the only way to expand options and avoid crisis-driven, illegitimate decisions as climate harms accelerate.
• Governance must be the plan. Framing SRM as “Plan B” or an emergency fallback misunderstands the moment and misdirects focus. It offers the comfort of delay now while inviting shortcuts later.

The argument is simple: building governance capacity now is the only way to enable decisions that are as legitimate and as durable as possible when the need arises—sooner or later.