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First off, slightly higher pressure has been shown to help in bacteria and I think in plant growth, but not in increasing the lifespan of mammals to my knowledge. Also, higher oxygen content is dangerous and even lethal to humans:Most creationists believe that the world before Noah's flood was very different. It was a lush garden, tropical from pole to pole. The "canopy" model of a watery layer above the Earth's atmosphere is the best way to understand how this is possible. The Scripture tells us that God separated the "waters from the waters on creation day 2 and placed waters above and on the Earth. The increased atmospheric pressure would have allowed a large amount of condensation at the end of each night cycle. This very heavy dew along with the "mist" would have been adequate to water the ground, so there was no need for rain on the Earth. This water above would have compressed the atmosphere and created both much larger creatures and greatly increased longevity. In laboratory conditions bacteria life spans are increased 10 times by this increased pressure. Our 70 to 90 years would be increased to 700 to 900 years. There would have been fewer animals since all the variety of species that exist today would not have been necessary. God created "Kinds" of animals not all the various species. There would have been a dog kind that included all the genetic variation to produce all the modern dogs plus wolves, dingoes, coyotes... When Noah's flood was over, the earth had changed radically. It would rain for the first time. The lush vegetation was gone. The climate was much more severe. And predatory behavior, animals killing other animals for food, became dominant. So the dinosaurs became extinct because of these new conditions.
. Doubling atmospheric pressure doubles the blood’s oxygen content. Doubling the blood’s oxygen content, by any means, can produce a disease, called retrolental fibroplasia, in unborn or premature children. An opaque membrane forms behind the lens of the eye, resulting in blindness. This also occurs in mice and other species.
Increased ambient pressure also results in excess carbon dioxide in the blood. Oxygen and nitrogen toxicities increase significantly. The problem is aggravated at high work levels and for the elderly and ill. [Personal communication with Daniel J. O’Rourke, M.D., 11 December 1994.]
Wait, plants have NO effect on c-14 ratios. They absorb and emit c-12 and c-14 equally and will REFLECT the current atmospheric ratio, but do not affect it in any way.laptoppop said:I have not heard folks talk about a high oxygen atmosphere -- I *have* heard some propose a higher pressure atmosphere -- like a hyperbaric chamber. I also have heard folks talk about a different c-14 ratio because of all the live plants over the globe.
http://icr.org/article/117/Wait, plants have NO effect on c-14 ratios. They absorb and emit c-12 and c-14 equally and will REFLECT the current atmospheric ratio, but do not affect it in any way.
Oh, okay.
First off, the issue in this thread is how they could possibly claim there was 100 times more biomass on the Earth. Do you have a citation for where creationists come up with that number or is it arbitrary?ICR said:A conservative estimate for the pre-Flood biomass is 100 times that of today. If one takes as a rough estimate for the total 14C in the biosphere before the cataclysm as 40% of what exists today and assumes a relatively uniform 14C level throughout the pre-Flood atmosphere and biomass, then we might expect a 14C/12C ratio of about 0.4% of today's value in the plants and animals at the onset of the Flood. With this more realistic pre-Flood 14C/12C ratio, we find that a value of 0.24 pmc corresponds to an age of only 4200 years (0.004 x 2-4200/5730 = 0.0024 = 0.24 pmc). Even though these estimates are rough, they illustrate the crucial importance of accounting for effects of the Flood cataclysm when translating a 14C/12C ratio into an actual age.
ICR said:A conservative estimate for the pre-Flood biomass is 100 times that of today. If one takes as a rough estimate for the total 14C in the biosphere before the cataclysm as 40% of what exists today and assumes a relatively uniform 14C level throughout the pre-Flood atmosphere and biomass, then we might expect a 14C/12C ratio of about 0.4% of today's value in the plants and animals at the onset of the Flood. With this more realistic pre-Flood 14C/12C ratio, we find that a value of 0.24 pmc corresponds to an age of only 4200 years (0.004 x 2-4200/5730 = 0.0024 = 0.24 pmc). Even though these estimates are rough, they illustrate the crucial importance of accounting for effects of the Flood cataclysm when translating a 14C/12C ratio into an actual age.
And from here:THE AIR THAT WE BREATHE
When our planet formed some 4.5 billion years ago, virtually all the oxygen on Earth was chemically bound to other elements. It was in solid compounds like quartz and other silicate minerals, in liquid compounds like water, and in gaseous compounds like sulfur dioxide and carbon dioxide. Free oxygen -- the gas that allows us to breath, and which is essential to all advanced life -- was practically non-existent.
Scientists have long thought that appearance of oxygen in the atmosphere was marked by two distinct jumps in oxygen levels. In recent years, researchers have used a method developed by University of Maryland geologist James Farquhar and Maryland colleagues to conclusively determine that significant amounts of oxygen first appeared in Earth's atmosphere some 2.4 billion years ago. Sometimes referred to as the "Great Oxidation Event," this increase marks the beginning of the Proterozoic period.
A general scientific consensus has also held that the second major rise in atmospheric oxygen occurred some 600 million years ago, with oxygen rising to near modern levels at that time. Evidence of multicellular animals first appears in the geologic around this time.
"There has been a lot of discussion about whether the second major increase in atmospheric oxygen was quick and stepwise, or slow and progressive," said Wing. "Our results support the idea that the second rise was progressive and began around 1.3 billion years ago, rather than 0.6 billion years ago."
That's not to say it wasn't subject to fluctuation:3) The "oxygen revolution" stems from the first appearance, 3 billion years ago, of organisms releasing O2 as a metabolic waste. This process led to a first great "oxygenation event", 800 million years later, with a second one occurring one billion years ago. This second event is believed to have eventually fuelled the appearance of complex life-forms during the Cambrian explosion about 543 million years ago (2). More recently, 425 million years ago, O2 levels were a major factor in the progressive adaptation of aquatic arthropods and vertebrates to terrestrial life (3). Accordingly, evolutionary analyses encompassing the past 2.3 billion years have revealed a correlation between increased organism complexity and the development of aerobic metabolism (4).
Recent evidence suggests that oxygen levels were suppressed worldwide 175 million to 275 million years ago and fell to precipitously low levels compared with today's atmosphere, low enough to make breathing the air at sea level feel like respiration at high altitude.
Now, a University of Washington paleontologist theorizes that low oxygen and repeated short but substantial temperature increases because of greenhouse warming sparked two major mass-extinction events, one of which eradicated 90 percent of all species on Earth.
In addition, Peter Ward, a UW professor of biology and Earth and space sciences, believes the conditions spurred the development of an unusual breathing system in some dinosaurs, a group called Saurischian dinosaurs that includes the gigantic brontosaurus. Rather than having a diaphragm to force air in and out of lungs, the Saurischians had lungs attached to a series of thin-walled air sacs that appear to have functioned something like bellows to move air through the body.
Ward, working with UW biologist Raymond Huey and UW radiologist Kevin Conley, believes that breathing system, still found in today's birds, made the Saurischian dinosaurs better equipped than mammals to survive the harsh conditions in which oxygen content of air at the Earth's surface was only about half of today's 21 percent.
The paper also is part of Ward's new book, "Out of Thin Air: Dinosaurs, Birds and Earth's Ancient Atmosphere," published this month by Joseph Henry Press. In the book, Ward argues that dinosaurs became the monsters that ruled the Earth for more than 60 million years -- and survived mass extinctions that destroyed many other species -- because they developed respiratory systems far more efficient than other terrestrial creatures.
Dinosaurs first appeared in the last part of the Triassic period, about 230 million years ago. That was during one of the lowest ebbs of atmospheric oxygen content of the last 500 million years, but he speculates that it took some time, until oxygen levels rose appreciably, before dinosaurs grew to their familiar gargantuan sizes.
"Dinosaurs thrived and nothing else did. There's an explanation for that, and it is that the air sac breathing system in dinosaurs and their descendants, modern birds, is more efficient than systems used by other organisms," Ward said.
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