Hopefully future global warming won’t get anywhere near temperatures of 250 million years ago-
But If it did- we'll get over it.
Boffins have discovered that "lethally hot" ocean temperatures kept the Earth devoid of life for millions of years after the mass extinction that occurred 250 million years ago. Cracked earth The global wipeout that ended the Permian era, before dinosaurs, wiped out nearly all of the world's species. Mass extinctions like …
So in the past the earth has been to the two extremes of a Snowball and a Desert.
It begs the question, is MMGW just speeding up the natural process?
I can imagine an alternative reality where the earth is cooling down and there are tax breaks on producing as much CO2 as possible to keep the planet warm.
"I can imagine an alternative reality where the earth is cooling down and there are tax breaks on producing as much CO2 as possible to keep the planet warm"
Yes that is great, imagination. Laudable. But it isn't science. Right now the science says that any cooling that may happen is thousands of years in the future. So in the meantime between now and then we are making the planet inhospitable, edging ourselves closer to "uninhabitable by our current civilisation". Maybe a race of evolved cockroaches will thank you for your continued CO2 emissions.
'What about life around the deep-water thermal vents? Is there any evidence of when that started up?'
The last time I was trawling the literature the evidence from genetic studies of the various species found around hydrothermal vents is that none of them are older than 100 million years and all have links back to well-established species found in more 'normal' conditions.
There are about half a dozen known vent provinces around the world with very little commonality of species between them. Instead it appears that different species evolve to occupy the same niches in different places.
Whether life started there remains an open question.
"There are about half a dozen known vent provinces around the world with very little commonality of species between them. Instead it appears that different species evolve to occupy the same niches in different places."
Interesting. One option would have been that if they *had* evolved when the whole ocean was at 40 C they would be fairly similar as the ocean cooled and they had to retreat back to these hot pockets.
That suggests they evolved at their sites *after* the global hot period.
Thanks for the info.
Indeed, not sure how they can reconcile these two statements;
"EARTH was BAKING LIFELESS DESERT for 5 MILLION years."
"In the dead zone, the tropics would have been very wet but with almost nothing growing, no forest, only shrubs and ferns, no fish or marine reptiles, just shellfish and virtually no land animals. Only the polar region would have offered any refuge from the blistering heat."
A desert means it doesn't rain (thus Antarctica is a desert). I suppose it is possible that the tropics were very wet in the sense there was lots of water but perhaps it never rained. If this is what they meant in the article they need to explain it better.
The day before yesterday it was cold. Yesterday, my friend and I were walking along a busy road, and the sun was shining. It felt nice and warm. "There's loads of cars here" said my friend. "That's what must be causing the heat". From there we walked into a shady, wooded area where there were no cars, and it felt much cooler. My friend was thus able to prove to himself and to me that it was indeed the cars and their exhaust that had been causing all the heat by the roadside. Was he missing something? He certainly didn't think so.
Lrn2Albedo : ) it depends on what the roads are made out of:
Fresh asphalt: 0.04*
Worn asphalt: 0.12*
New concrete: 0.55*
New white portland cement concrete: 0.7-0.8**
Old concrete: 0.25**
Conifer forest (summer): 0.08-0.15*
Deciduous trees: 0.15 to 0.18
If it were as simple as that, we could cool the planet by bulldozing the forests and replacing them with concrete parking lots. Furthermore, clear-cutting forests for crops or grazing would also be expected to cool the planet ***
Please note, I'm not advocating any such ridiculous action... just pointing out that your simplified explanation is oversimplified to the point of being somewhat misleading. Canopy effect, pervious vs. impervious (absorbed heat transferred into the atmosphere as water vapor instead of ΔT), and surface area (a topographic 1m² of concrete/asphalt is essentially 1m² - while a topographic 1m² of tree leaves is actually much more than that when you look at the surface area exposed to the atmosphere) - just to name a few.
There is a quite reasonable explanation why the temperature at 2m on an asphalt parking lot > concrete parking lot > field > forest... but albedo, by itself, is not it.
"In the dead zone, the tropics would have been very wet but with almost nothing growing, no forest, only shrubs and ferns, no fish or marine reptiles, just shellfish and virtually no land animals."
I'm not surprised the land animals were all dead with nothing to eat but shellfish served at 50C.
That is until our "Ancient Geo Engineers" showed up, read all about it in"Pyramid Gravity Force"............Stop drinking the Kool Aid.......and learn about the biggest discovery of the 10 thousand years..........OMG......! Who is in charge on this Planet..........? Stop drinking the Kool Aid and learn how the Earths temperatures are controlled in the Book "Pyramid Gravity Force" available on Amazon, find out how mans penitration in Cheops the great pyramid of Giza, disabled the great pyramid of Giza which controlled the Hawaiian Island vocanic activity. Yes the Giza pyramid was the Earths thermostat until crazy humans broke it, read how the Earth has missed a few crucial mini ice ages and how we have a chance of saving the planet by getting the Giza pyramids back on line. Ancient Geo Engineering is real......And we still have a chance to save planet earth from the massive tectonic plate movements that are coming to blast us all back into the stone age. Regardless of why the temperature rises on planet Earth, The pyramids are here to cool the planet down. We can't afford to do stupid anymore..............!This technology is written in all the ancient text.........Hello is anyone out there..............?
not so much save the planet, but preserve civilization. cos as any fule kno pyramids store time (duh) and slowly leak it out into whatevers inside them, this way razor blades can be placed in pyramids, taken back in time to when they were sharp, which allows men to be clean shaven, which is the mark of civilization (see anywhere-stan for proof)
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