The climate change movement: July 28, 1995 to August 14, 2020 RIP

[aerohead]

Originally Posted by freebeard

There's a 'memo'?

I can't focus enough to read this whole thing, but I did catch this:

www.nature.com: Abrupt reduction in shipping emission as an inadvertent geoengineering termination shock produces substantial radiative warming


"The best laid schemes o’ Mice an’ Men Gang aft agley," -- Robert Burns

Benjamin Franklin would understand the implications. He 'discovered' the relationship between 'false-albedo' and warming.
Bunker fuel issues aside, wait until you see how much additional warming is in store when all the coal-fired power plants are shuddered, and their sulfate aerosols precipitate out of the atmosphere.

[freebeard]

Originally Posted by Duckduckgo

No results found for "false-albedo".

The air traffic pause on 2001-09-11 was instructive.

[aerohead]

Originally Posted by freebeard

The air traffic pause on 2001-09-11 was instructive.

Presently, the ultraviolet and white light striking Earth's upper atmosphere is encountering coal-fired power plant-derived sulfate aerosols which reflect a portion of the oncoming solar insolation back out to space, acting as a 'parasol.'
When the coal-fired plants are idled, these light-scattering particles will 'rain-out' from the sky, increasing the amount of solar energy entering the troposphere.
We'll blow right past the 1.5-degree Celsius limit the scientists hoped we could avoid.
The run-away greenhouse effect will kick in, like on Venus, steering us towards mass extinction.
As John Dutton remarked, 'Earth will shed it's skin', and mankind will cease to be.

[freebeard]

Thanks.

If the Sun sheds it's skin it will be the Younger Dryas all over again.

[redpoint5]

There are no projections in the IPCC report of exceeding 1.5C and causing a runaway Venus event.

Who knows what insane technology we'll have just 50 years from now. Future generations will wonder how we managed to live as savages, eating flesh from bones, suffering common colds, and toiling with menial tasks day to day.

Anyone see the SpaceX launch today?

[freebeard]

Ha! Boeing delivered two astronauts to the ISS without any doors falling off; and the news was completely buried in noise.

The Earth is a homeostatic system; we need to learn to live within the tolerances. Every slippery slope meets a brick wall.

How about a metamaterial that upcycles IR into a visible wavelength? You get night vision without having to convert photons to electrons and back again.

newatlas.com: Night-vision lenses so thin and light that we can all see in the dark

“This is the first demonstration of high resolution up-conversion imaging from 1550-nm infrared to visible 550-nm light in a non-local metasurface," said author Rocio Camacho Morales. "We choose these wavelengths because 1,550 nm, an infrared light, is commonly used for telecommunications, and 550 nm is visible light to which human eyes are highly sensitive. Future research will include expanding the range of wavelengths the device is sensitive to, aiming to obtain broadband IR imaging, as well as exploring image processing, including edge detection.”

The latest work improves on their previous research into night vision using a gallium arsenide metasurface. This time, they found that the lithium niobate metasurface delivered more efficient light processing over a wider surface area.

Also, from Hacker News: geospatial.netlify.app/posts/gds-2024-04-20-cathedrals/

Unanswered question
Now we know that the cathedrals are not aligned on the geodesic. Are they “almost” aligned on the mercator projection by accident or was there a plan?

Did the builders knew the earth was round? Or did they followed some method that is today lost, possibly based on the position of a start or a constellation, resulting in an alignment on the Mercator projection?

Certainly 7 cathedrals are too many to be a coincidence, and more historical investigations about the past knowledge would be at this point an interesting project.

Complete with Python code if you want to check their work.

[Piotrsko]

The Boeing ship has numerous partial failures, mostly in the helium thruster system for fine positioning. They almost had to abort and return to earth. Might have to refill the helium tank before they depart. <edit> why are they using helium?

If Boeing designed a NEW plane from scratch, I'm not sure it would get certification

[redpoint5]

I finally got a chance to watch the SpaceX launch, and it was quite impressive. The insane thing is the plan is to eventually churn out 1 brand new Starship every day. That compared to NASAs 6 space shuttles.

The 1% chance of death on every space shuttle launch will need to be improved if they are to occur every day.

https://www.spacex.com/launches/miss...rship-flight-4

Originally Posted by Piotrsko

why are they using helium?

It's the lightest weight inert gas, is my guess. Helium is also used to force propellant to motors as the tanks are rapidly depleted.

[Piotrsko]

Originally Posted by redpoint5

It's the lightest weight inert gas, is my guess. Helium is also used to force propellant to motors as the tanks are rapidly depleted.

Last I heard they have massive pumps (turbines) feeding the thrust motors. The helium should be used to prevent cavitation and tank collapse because there's no appreciable atmosphere to vent the tank. Only reason to use helium that I can think of is that it's readily available as either a compressed gas or liquid all over the launch site. Not so sure about inert.

[redpoint5]

Originally Posted by Piotrsko

Last I heard they have massive pumps (turbines) feeding the thrust motors. The helium should be used to prevent cavitation and tank collapse because there's no appreciable atmosphere to vent the tank. Only reason to use helium that I can think of is that it's readily available as either a compressed gas or liquid all over the launch site. Not so sure about inert.

Yeah, my description wasn't right. The spent fuel has to be backfilled with something. I still think the inertness is a consideration because you don't want to change the fuel/oxidizer ratio by using a flammable gas, and just generally you want as little flammable stuff as possible in places that shouldn't be on fire.