The latest on Stardust

[H simmens]

Here is the latest on Stardust, the Israeli American company that is planning on commercializing SRM. 

They apparently will be releasing a couple of documents shortly on their principles and their approach to cooling but without revealing their proprietary particle. 

Herb

https://www.theatlantic.com/science/2026/04/stardust-solar-radiation-management/686664/?gift=7xcM8mor32xLz6jJ7Vo2S4R9td6NeB-x4hG67iyuc9U

Herb Simmens

Author  of A Climate Vocabulary of the Future

“A wonderful achievement, a SciencePoem, an Inspiration, a Prophecy, also hilarious, Dive in and see"

 Kim Stanley Robinson

@herbsimmens

[Paul Klinkman]

Dear Restorers,

The problem with an unknown particle X is how the particle's toxicity to human lungs, or its lack of toxicity, fits the total climate equation.  Testing takes time.

I can see, for example, a successful proposition where excess sulfur sprayed into Antarctica's stratosphere during the Austral spring and summer is expected to cause 10 more asthma deaths per year worldwide, but it also prevents ten million starvation deaths per year through weather stabilization.   In the long run true integrity that weighs the known risks talks and salesmanship walks.  Being proactively honest about an imperfect but potent solution is going to be the only way through for initial SAI use.  Further, it will help your own advocacy to name what solutions you prefer about limiting new hydrocarbon and NO2 sources, cleaning CO2 out of the atmosphere by natural or mechanical means and dealing with our apparent megadrought, polar collapse and rapid intensification hurricane risks.

How safe or how toxic to lungs are sea salt microparticles?  Salton Sea dust should be a far worse health hazard than sea salt particles, but the general link between dust and asthma is troubling.   If unfiltered cigarettes are known to be unsafe, does that somehow make filtered cigarettes safe?

https://theconversation.com/toxic-dust-from-californias-shrinking-salton-sea-is-harming-childrens-lung-growth-our-study-tracked-the-impact-in-700-kids-279211

Yours in ultimate Hope,

Paul Klinkman

[John Macdonald]

Hi Paul and Coolers

What if we cooled Earth using the Moon?

The Moon Dust Project: send one Starship to the lunar south pole. A small swarm of rovers wakes up, harvests dust and ice, then 3D-prints more rovers + launchers using only lunar resources.

They fire fine Moon dust toward L1, creating temporary hazy dust clouds that gently scatter ~1-2% of sunlight — like a soft veil over the Sun.

No chemicals in our atmosphere. Fully reversible. Self-sustaining after the first landing. Solar + hydrogen from polar ice powers everything.

One seed → a living swarm → a gentle solar veil for Earth.

Buying time while we cut emissions and go multi-planetary.

John Macdonald

On 5 Apr 2026, at 1:54 am, Paul Klinkman <paulkl...@gmail.com> wrote:



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[Paul Klinkman]

Hi John,

You have challenged a far more prolific inventor than you might expect.  

I don't expect any space-based climate solutions to be economically competitive with earth-based climate solutions for several decades.  The leader in 50 years, in my opinion, will be a mission to a small iron asteroid in solar orbit.  The iron in the asteroid must be reassembled into fairly crude solar sail pieces.  Crude solar sails will then be sailed back to a spot near earth's L1 point and stopped.

Key one will be creating the solar sails out of iron atoms.  I see a multi-step process where, in a non-vacuum, a thin, wide and long bubble surface is formed.  Then iron atoms are deposited using vapor deposition.  Then the original bubble material is vaporized in vacuum so that the bubble material may be used again and again.  

These paper-thin sheets of iron must then be carefully bonded together into a big wheel of a solar sail.  The wheel spins to stay inflated as a wheel using centripetal force.  A control satellite in the center, let's name it the sail's "spider", pulls on little cables to gently adjust the wheel's orientation in the solar wind and its spin rate.  

These won't be your grandfather's incredibly thin solar sails.  They'll be relatively thick and s slow to move.  Each wheel is likely to need years to be steered down to earth's L1 orbit and stopped, probably with gravity slingshot moves.  The control satellite should then be able to maintain each solar wheel's exact position in orbit for many years, although we need to plan ton install a new generation of satellite control units every 20 years or so.    

Hopefully this system comes up with many square kilometers of solar sail at L1 that stays in place for decades and that can be recycled in space perhaps, with no dust dispersion or space pollution unlike a cloud of dust.  Hopefully only one or two robotic space missions get the entire job done.

Again, this costs too much with 2020s technology and we need a horse race of shorter-term solutions at this point..  

Yours in Hope,

Paul Klinkman