SniperWoreConverse posted:

https://www.youtube.com/watch?v=cmAlQvDQGoI

the process is basically

1. temp spike causes spike in water evap
   
2. water is a low intensity, wide-band greenhouse gas, which spikes temp more
   
3. eventually too much water evaporates, causing insane levels of atmospheric water content
   
4. Komabayashi–Ingersoll limit is passed. The earth is no longer capable of radiating as much heat as it receives from the sun.
   
5. "Primordial Venus:" the oceans rapidly entirely evaporate. Surface pressure and temp is insane. Everything is dead, but water is technically present.
   
6. Last chance: geological activity may sequester enough greenhouse gas to reduce below the limit again. It may not.
   
7. It might not do it fast enough because the atmosphere is being eroded by the sun, water is now being dissociated by UV
   
8. Free hydrogen is being blasted out into space, reducing the amount of water in the atmosphere.
   
9. Current Venus, but with a large moon. Without adding more hydrogen, or at least water, there is no return from this state.
   

It was calculated roughly that the average global temp being 47c could cause this, if the situation went bad enough and the atmospheric composition was unlucky enough at the time..

Possible climate transitions from breakup of stratocumulus decks under greenhouse warming posted:

Stratocumulus clouds cover 20% of the low-latitude oceans and are especially prevalent in the subtropics. They cool the Earth by shading large portions of its surface from sunlight. However, as their dynamical scales are too small to be resolvable in global climate models, predictions of their response to greenhouse warming have remained uncertain. Here we report how stratocumulus decks respond to greenhouse warming in large-eddy simulations that explicitly resolve cloud dynamics in a representative subtropical region.
In the simulations, stratocumulus decks become unstable and break up into scattered clouds when CO2 levels rise above 1,200 ppm. In addition to the warming from rising CO2 levels, this instability triggers a surface warming of about 8 K globally and 10 K in the subtropics. Once the stratocumulus decks have broken up, they only re-form once CO2 concentrations drop substantially below the level at which the instability first occurred. Climate transitions that arise from this instability may have contributed importantly to hothouse climates and abrupt climate changes in the geological past. Such transitions to a much warmer climate may also occur in the future if CO2 levels continue to rise.

Possible climate transitions from breakup of stratocumulus decks under greenhouse warming posted:

When CO2 levels are lowered again after the stratocumulus breakup, the stratocumulus decks only reform once the CO2 levels drop below 300ppm (Fig. 3a,b). That is, there is bistability as a function of CO2 levels, and this results in hysteresis.

Losing Marine Stratocumulus Clouds Could Create a Mega-Hothouse Climate posted:

If humanity maintains its current business-as-usual emissions path for the next 100 years, the resulting 4°C (7°F) of warming may be enough to cause highly reflective stratocumulus clouds over the subtropical and tropical oceans to disintegrate, resulting in an additional 8°C (14°F) of warming, according to research published in February. The resultant “Hothouse Earth” climate, 12°C (22°F) warmer than pre-industrial levels, would be enough to melt all ice on the planet, raise sea levels by over 200 feet over a period of centuries, and produce heat waves too hot for humans to endure outdoors for over half of Earth’s population (as currently distributed.)

quote:

When might we see 1200 ppm of carbon dioxide?
The current business-as-usual emissions path humanity is on, called RCP8.5, has Earth’s atmosphere reaching carbon dioxide levels around 1100 ppm by the year 2100. This scenario would require the world to massively expand coal use and not make additional efforts to reduce greenhouse gases over the rest of this century, and is considered unlikely by some. However, as explained in our April 2 post, Global CO2 Emissions Hit an All-Time High in 2018; is a Hothouse Earth in our Future?, even if we manage to limit global warming to the Paris Accord target of 2.0°C above pre-industrial levels, we might cross a threshold that would set in motion amplifying feedbacks that could well push irreversibly into such a “Hothouse Earth” state over a period of centuries, taking us beyond the 1200 ppm of CO2 threshold.

SixteenShells posted:

you can sometimes find dry ice at grocery stores, would cryogenic ethanol be a viable alternative to a high-spec freezer?

inchworm posted:

degrees

Samuel Glompers posted:

When

If you say now, I'll

I don't have anything to threaten you with

Samuel Glompers posted:

When

If you say now, I'll

I don't have anything to threaten you with

OIL PANIC posted:

My naive read is that this refers to global average air temp (at 2M above sea level?). It’s currently around 15 degrees C, and those effects would occur at about 47 C.
Edit: 20th c average was 13.9C; last year averaged 15.08C
https://www.ncei.noaa.gov/access/monitoring/monthly-report/global/202313

hamas ftw posted:

it's not too late to change direction

smoobles posted:

ahh finally ... line go down

Samuel Glompers posted:

When

If you say now, I'll

I don't have anything to threaten you with

Venomous posted:

is it happening yet

Scarabrae posted:

it would be hilarious if Venus had a sentient race in the eons past that hosed up everything like we are doing, some sort of great filter

hamas ftw posted:

it did they were called humans

RandomBlue posted:

their elon musk terraformed and colonized earth and seeded our elon musk

Stereotype posted:

we only sent one mission to Venus because under the acrid layers of dense sulfur clouds is a bunch of cars

Cabbages and Kings posted:

mdemone posted:

I'm increasingly sure that this exact thing happened.

they're in a better radius/surface gravity situation than Earth is. liquid water for billions of years. phosgene in the atmosphere a billion years later.

this has all happened before. and it will all happen again.

celadon posted:

hm this seems to imply the easiest way to save the long term future of earth is global thermonuclear war and the destruction of all industry and human life

Salt Fish posted:

It probably won't. The primordial earth had all these gases in the atmosphere don't forget, and it was much hotter then we'll ever make it. WORST CASE we're looking at a billion years of sterile rock, nbd.

Stereotype posted:

really though we should just shoot a bunch of extremophile bacteria at mars and try and seed life on it that could maybe survive and evolve over hundreds of millions of years until it’s just Earth. maybe they won’t gently caress it up. third time’s the charm.

HAIL eSATA-n posted:

if the sun expands enough to swallow the earth, will my real estate investments transfer to the 'surface' of the sun?

HAIL eSATA-n posted:

if the sun expands enough to swallow the earth, will my real estate investments transfer to the 'surface' of the sun?

celadon posted:

hm this seems to imply the easiest way to save the long term future of earth is global thermonuclear war and the destruction of all industry and human life

SixteenShells posted:

fascinating! thanks for the info

how much land do you have set aside for this? if you're replacing an indoor operation it's gotta be not even an acre, right?

Real hurthling! posted:

was thinking today how lucky it was that we killed all the north american buffalo. could you imagine the carbon levels today with billions more large ruminants on the plains?

quote:

BUFFALO (AP) — A judge on Monday dismissed terrorism-linked charges against a college professor accused of illegally obtaining biological materials for an art exhibit protesting United States government food policies.

The judge, Richard J. Arcara of Federal District Court, ruled that a mail and wire fraud indictment brought nearly four years ago against the University at Buffalo professor, Steven J. Kurtz, was “insufficient on its face.”

Professor Kurtz is a founding member of the Critical Art Ensemble, which has used DNA and other biological materials in works meant to draw attention to political and social issues. His arrest drew international attention, with artists in several countries protesting the charges as an intrusion on artistic freedom.

He became the target of a terrorism investigation in May 2004 when firefighters found the materials — two kinds of bacteria — and equipment they deemed suspicious after a 911 call to his home. Professor Kurtz had called to report that his wife was dead, apparently from a heart attack.

Although investigators determined that lab equipment used for DNA extraction and amplification equipment were part of his artwork and that his wife, Hope Kurtz, died of natural causes, he was indicted a month later on charges that carried a maximum of 20 years in prison.

Real hurthling! posted:

was thinking today how lucky it was that we killed all the north american buffalo. could you imagine the carbon levels today with billions more large ruminants on the plains?

Rauros posted:

dude, that was ecologically balanced before white people ruined it. bison are selective grazers that maintained the tall grass prairie, a good carbon sink. max numbers were 30 million, the same number of beef cows we have now. they can't be added to existing cattle, because bison land is now filled with corn to feed the cattle.

mdemone posted:

I'm increasingly sure that this exact thing happened.

they're in a better radius/surface gravity situation than Earth is. liquid water for billions of years. phosgene in the atmosphere a billion years later.

this has all happened before. and it will all happen again.

mdemone posted:

I'm increasingly sure that this exact thing happened.

they're in a better radius/surface gravity situation than Earth is. liquid water for billions of years. phosgene in the atmosphere a billion years later.

this has all happened before. and it will all happen again.