Geoengineering is already going on, at an unimaginable scale: we are ABOVE 600 parts per million of CO2 EQUIVALENT…. That is the Antarctica metastable point! Below 600 ppm CO2 equivalent, Antarctica freezes over. Above, it melts. The lunatics say reaassuringly that it all happened before. Yes, well, no, man didn’t happen before. The geoengineering in place is properly astounding. The talisman of electric cars won’t repeal it…
The paltry 420 ppm of CO2 usually rolled out considers only CO2 not all the man-made GreenHouse Gases such as CH4, NOx, Fluorocarbons, etc. which have a much stronger infrared retention factor per mass.
So far all the geoengineering schemes proposed were silly as they wanted to mitigate the temperature rise. But CO2 per se is dangerous: it acidifies oceans, to start with. The safe thing to do is to emit less CO2. And nuclear energy is the obvious way to do that. Potentially all electric production could be nuclear. All the objections to nuclear energy can be overruled by using more advanced technology: reactors can be made safe, non proliferating and eating their own waste.
The prominent greenhouse gas is water vapor. Water vapor is Earth’s most abundant greenhouse gas. It’s responsible for about half of Earth’s greenhouse effect. Man-made GHG and CO2 leverages the H2O. Crafty geoengineering would act on the H2O. A recent paper pointed out that what matters is high altitude H2O. “We introduce a climate intervention strategy focused on decreasing water vapor (WV) concentrations near the tropopause and in the stratosphere to increase outbound longwave radiation...” They claimed it’s injected only in a few equatorial places (I think it’s more complicated than that). An idea would be to turn the vapor into rain before it could go stratospheric… If it really goes up only in a few spots. Here is an example of the sort of offending equatorial cloud which sends a lot of H2O into the startosphere:
Those researchers from the National Oceanic and Atmospheric Administration suggest trying what they call “intentional stratospheric dehydration.” According to study lead author Joshua Schwarz, a research physicist at NOAA’s Chemical Sciences Laboratory in Boulder, Colorado… a place just above which I once charged a mountain lion in the snow while it was sneaking on elks… It happened accidentally; I was charging downhill in snow, and pretended to be unphazed when I arrived perpendicular to the fierce predator’s own trajectory… Long story… I had my German sheperd Mandy bouncing behind… Anyway back to science… the concept would involve seeding small particles known as ice nuclei into the stratosphere using high-altitude aircraft.
One small region above northern Australia appears to be particularly important in controlling the upward movement of air and water vapor. In general, there is massive injection of H2O at high altitude above the equator, as thunderclouds can go up to 18 kilometers there, and then the water migrates polewards towards the tropics.
“If we could do something just in that little area, maybe we could reduce stratospheric water vapor in order to let more infrared radiation out [into space] — that’s the basic idea,” Schwarz said.
Giant artificial near stratospheric mountains disposed strategically with nets in between may be a passive way to do that. I would say, somewhat tongue in cheek… Except that this could come naturally in connection with SPACE ELEVATORS (the material for building space elevators on Earth exist, or nearly so…)
Patrice Ayme
Clouds forming above 7000 meters high Machapuchare a peak in Nepal, which would be in a sub tropical area, if at sea level:
The interest of drying the stratosphere would to decrease the CO2 production through nonlinear self feeding exponential effects by say melting permafrost, and methane ice… To dehydrate the stratosphere part of the atmosphere one would have to precipitate the big equatorial injectors before they could do what they are doing now:
The preceding was inspired by Ian Miller: Has Geoengineering a role in Climate Change? Posted on March 20, 2024:
In a previous post I looked at the effect of tree-planting to help counter climate change. This time I shall look at geoengineering. The United Nations Environmental Assembly considered a resolution on solar radiation modification, which called for the convening of an expert group to examine the benefits and risks. The resolution was withdrawn because the non-experts could not agree on whether to form the panel. Well, that was a huge achievement! It is claimed that research has identified potential risks, such as unpredictable effects on weather, biodiversity loss, undermining food security, and infringement of human rights across generations by passing on huge risks to generations that will follow us. In short, the risks that something will happen are the same as what we know will happen now. These changes are locked in, and are not risks. However, not all proposals are sensible.
Proposals include injecting millions of tonnes of aerosols into the stratosphere. The critics say this would alter global winds and rainfall patterns, leading to more drought and cyclones, exacerbate acid rainfall and slow ozone recovery. That would depend on what is done. It is not necessary to fire acidic material or ozone depleting material up there. The one criticism that is reasonable is that this expensive operation would have to be carried out continuously. Missing in action was a proposal to insert potential “dust” particles into aero-jet engines to make long-lasting contrails. A possibility would be something like diethyl zinc. Zinc oxide should remain volatile within the engine. There may be other problems, such as fuel storage but at least consider it.
An alternative is to make low-level clouds brighter by spraying microscopic seawater droplets into the air. This was rejected because there is no peer-reviewed evidence that it would work. Given nobody is trying, and looking at the attitude of potential reviewers, that rejection is ridiculous. As an example of “expert opinion”, one comment was, “Even if it worked, it is hardly environmentally benign.” That is a fairly good sign such a project would be rejected. On the other hand, not doing it makes sense: it would also be too expensive, so it would never happen.
One project was to spread tiny glass spheres over large areas of sea ice to brighten the surface. This failed – they sped up the loss of sea ice. A little thought on the physics would have indicated the spheres would refract the light and concentrate it in spots and enhance absorption when the sun was at an angle, which it usually is where there is sea ice. Another proposal was to spray the ocean with microbubbles or foam. If you cannot see what is wrong with that proposal, you are not thinking clearly.
So what do they think is the answer? Apparently 500 scientists signed an open letter calling for non-use of solar geoengineering, and argue that model studies suffer from uncertainties. Their answer to the problem is to cut greenhouse gas emissions. Apparently they have not noticed that we have made no progress on that at all, and we are accelerating in the wrong direction.
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What seems to have happened here is that the concept started with activity and not thought. The obvious was proposed to get research funding, which probably shut out those proposals that came later and had more thought. As for the self-styled “experts”, the proposal to pass the buck to someone else is unfortunately only too familiar. And no, I do not think geoengineering is the answer. There is no single answer, although a massive expansion of nuclear generation in molten salt reactors comes the closest to one.