Posted on 10/15/2021 12:33:25 PM PDT by Red Badger
For now, life is flourishing on our oxygen-rich planet, but Earth wasn't always that way – and scientists have predicted that, in the future, the atmosphere will revert back to one that's rich in methane and low in oxygen.
This probably won't happen for another billion years or so. But when the change comes, it's going to happen fairly rapidly, the study from earlier this year suggests.
This shift will take the planet back to something like the state it was in before what's known as the Great Oxidation Event (GOE) around 2.4 billion years ago.
What's more, the researchers behind the new study say that atmospheric oxygen is unlikely to be a permanent feature of habitable worlds in general, which has implications for our efforts to detect signs of life further out in the Universe.
"The model projects that a deoxygenation of the atmosphere, with atmospheric O2 dropping sharply to levels reminiscent of the Archaean Earth, will most probably be triggered before the inception of moist greenhouse conditions in Earth's climate system and before the extensive loss of surface water from the atmosphere," wrote the researchers in their published paper.
At that point it'll be the end of the road for human beings and most other life forms that rely on oxygen to get through the day, so let's hope we figure out how to get off the planet at some point within the next billion years.
To reach their conclusions, the researchers ran detailed models of Earth's biosphere, factoring in changes in the brightness of the Sun and the corresponding drop in carbon dioxide levels, as the gas gets broken down by increasing levels of heat. Less carbon dioxide means fewer photosynthesizing organisms such as plants, which would result in less oxygen.
Scientists have previously predicted that increased radiation from the Sun would wipe ocean waters off the face of our planet within about 2 billion years, but the new model – based on an average of just under 400,000 simulations – says the reduction in oxygen is going to kill off life first.
"The drop in oxygen is very, very extreme," Earth scientist Chris Reinhard, from the Georgia Institute of Technology, told New Scientist earlier this year. "We're talking around a million times less oxygen than there is today."
What makes the study particularly relevant to the present day is our search for habitable planets outside of the Solar System.
Increasingly powerful telescopes are coming online, and scientists want to be able to know what they should be looking for in the reams of data these instruments are collecting.
It's possible that we need to be hunting for other biosignatures besides oxygen to have the best chance of spotting life, the researchers say. Their study is part of the NASA NExSS (Nexus for Exoplanet System Science) project, which is investigating the habitability of planets other than our own.
According to the calculations run by Reinhard and environmental scientist Kazumi Ozaki, from Toho University in Japan, the oxygen-rich habitable history of Earth could end up lasting for just 20-30 percent of the planet's lifespan as a whole – and microbial life will carry on existing long after we are gone.
"The atmosphere after the great deoxygenation is characterized by an elevated methane, low-levels of CO2, and no ozone layer," said Ozaki. "The Earth system will probably be a world of anaerobic life forms."
The research has been published in Nature Geoscience.
A version of this article was first published in March 2021.
The idiots that do this “research” and write these “papers” need to be cut off from the government teat and get real jobs in the private sector.
What a load of horseshit.
The Brawndo Corp will save us.
They got electrolytes.
Even an Atheist would be skeptical...............
Getting rid of the life source for all plants, CO2, helps assure we will not have oxygen.
How can we tax ourselves out of this impending disaster?
Take the vaccine before you die.
Less carbon dioxide means more oxygen, not less.
This sounds like one of those fraudulent papers written to see how stupid journal editors have become lately.
Roughly around 6-8,000 ft or so. When the kids get cranky it’s popped up to around 10k. makes them sleepy, so pressure wise it’s 11-12psi.
Booster # 52937......................
C’mon man 100% vaxx plus carbon tax and fossil fuel ban will fix that…
That’s what I thought....................
Great song...
Ten Years After-1971-”I’d Love To Change The World”
-
https://www.youtube.com/watch?v=CTUsFm0BAu8
-
Tax the rich, feed the poor,
Til there are no rich no more.
I’d love to change the world,
But I don’t know what to do,
So I’ll leave it up to you.
If you’re an intelligent being of any kind, all of this is utter nonsense.
A billion years from now?
There are probably many other things, just as bad or worse, that will occur in this solar system before the oxygen runs out...
OMG!!!!!!!!!!!!!!!
We’re all gonna die!!!!!!!!!!!!!!!!!
One of my Favs...............................
There is no science anymore, only agenda-driven narratives.
Thanks. I needed something else to worry about.
What bunk
Get rid of CO2 and greenery dies...
Half of the world’s oxygen is produced via phytoplankton photosynthesis. The other half is produced via photosynthesis on land by trees, shrubs, grasses, and other plants.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.