Luke:
In the stratospheric balloon releases you have so far described, how many
grams of helium are required to loft one gram of SO2?
On Wednesday, December 28, 2022 at 6:09:51 PM UTC-5 lu...@lukeiseman.com
wrote:
> Thanks Andrew, Olivier, Bala, and everyone else for diving in with
>
Luke, you should also be aware of criticisms of short term CDR climate
intervention, eg by Höglund. He explained his arguments to Reviewer 2
https://open.spotify.com/episode/792ZqIXDuqTOVdoJE3ZNyu?si=mTUC3aQdS_yJqISL7H0rXw
He strongly criticises vertical stacking, arguing that short term
Luke,I will keep finding this rather murky as long as you keep being so hand-wavy about your numbers and then claiming you can offset a “substantial amount of warming” in your homepage.Weather balloons have different bursting altitudes depending on 1) payload 2) amount of helium used to inflate 3)
Thanks Andrew, Olivier, Bala, and everyone else for diving in with
critiques here. I'm a cofounder of Make Sunsets and want to clarify a few
things:
*Honesty: *
We have no desire to mislead anyone. If we make a mistake (which we will),
we'll correct it.
*Radiative Forcing:*
I didn't make
sorry, I must correct myself. The French media quotes 27 kg CO2eq / passenger /
flight. See
https://gazette-du-midi.fr/au-sommaire/entreprises/zephalto-toucher-presque-les-etoiles
- Mail original -
De: "olivier boucher"
À: "geoengineering"
Cc: "Wake Smith"
Envoyé: Mercredi 28
Costs can't be usefully calculated this way, as the crew compartment weight
is likely more than that of the crew. Further, the propellant almost isn't
isn't sulfur based, which would represent a large cost saving (albeit only
for the final part of the flight).
Andrew
On Wed, 28 Dec 2022, 19:22
https://zephalto.com/en/
Zephalto is a start-up backed by the French spatial agency CNES that positions
itself on low-carbon and safe "space" travel in the stratosphere at 25 km. I
couldn't find what low carbon means on their web site, but I've read a French
media quoting 27 t CO2eq per
Thanks Olivier for putting the numbers together - wanted to do it as well but I’m still conflicted over whether it’s better to ignore them or call out the BS.Few more things (probably some are new) I also found while browsing their website that suggest this is just really a silly publicity
Latex balloons are subject to substantial UV degradation in flight, and are
prone to damage on the ground. They need trackers to recover them (unless
you're releasing thousands), which AFAIK MS don't use. So recovery and
reuse claims remain to be demonstrated in this use case, to my knowledge.
On
Thanks Olivier for putting the numbers together - wanted to do it as well but I’m still conflicted over whether it’s better to ignore them or call out the BS.Few more things (probably some are new) I also found while browsing their website that suggest this is just really a silly publicity
*Make Sunsets sells "cooling credits" for $10 and alleges that 1 gram of
sulfur particles offsets the impacts of 1 ton of carbon emissions.*
*By Lauren Leffer *
*27 December 202*
A startup says (Make Sunsets) it has begun releasing sulfur particles into
Earth’s atmosphere, in a controversial
Thank you Andrew for pointing to this Make Sunset news which I had not seen.
I find their calculations to be both optimistic and misleading.
"The key number -.62 W/m2 radiative forcing created for a year by injecting 1
Tg of sulfur" based on several studies
- Ferrero et al 2012 did not
The $10 per gram for "cooling credit" is mentioned in the original MIT
technology review news
On Wed, 28 Dec 2022, 15:52 Reiss Jones, wrote:
> Thanks both for sharing these calculations on this.
>
> Bala, where did you get your $10 per gram number from? That would be
> $1,000,000 per tonne
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