Re: Global warming is NOT a science
Posted: Sun Apr 01, 2018 1:53 am
Atla - my apologies.
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It's clear that sometimes species shape the Earth at times. It's now humans.gaffo wrote: ↑Sun Apr 01, 2018 1:50 amwith respect I think you are confused here. the increacing o2 levels via BG algae created the "snowball earth" `1-2 billion yrs prior to the "great dying" which was much later and was used to be thought of via a comet/asteroid/supper nova...............and today viewed as due to the deccan traps (volcanoes)./Greta wrote: ↑Sun Mar 25, 2018 1:38 amgaf, yes, it was a different world then with different conditions, prone to ice agesgaffo wrote: ↑Fri Mar 23, 2018 5:41 am
i think you are refering to the "snowball earth" which was 2 billion years before "The Great Dying", where algae removed CO2 and returned o2 back into the atmosphere. o2 is a poor greenhouse gas.
it is still a mystery - we have no knowledge of the primorial makeup of Earth's Atmosphere (which had no o2 in it) - it is assumed that it had enough co2 to compensate for a far weaker sun (2/3's that of today's sun) -enough to allow for liquid water (maybe the mantle had enough heat from Earth's formation and the twice the amount of radioactive metals in the mantle to help keep the earth warm in spite of the weak sun).
the latter was due to the Deccan Traps - indian ocean area of "hot mantle" that spewed CO2 into the atmosphere for millions of years via volcanoes.
the main relevantly transformative effect of the blue-green algae to humanity and other complex life was not CO² levels but oxygen, which was produced by those first photosynthesisers. Oxygen was toxic to almost all existing organisms, thus 90% of them died out in the Permian extinction event. Yet the oxygen made complex multicellular life possible.
Basically, the biosphere restructured itself - it underwent metamorphosis. It is doing it again today. At this stage it appears most likely that the future of the Earth's surface in following centuries will have many fewer large and complex organisms but many more intelligent machines and cyborgs.
I'm not one to jump to conclusions - esp since so far "We really don't know" which of the above was the cause of the "great dying".
--------but IMO if you think that the "great dying" was due to BG algae pumpig o2 into the atmos - your conclusion is wrong.
the great dying was much later - when amimals lived - all animals need o2 to live. so o2 is not relivent to their "Dying" per this particular.................not to mention said dying was much later than snowball earth era.
2-cents.
Isn't there a lag between temperature rise and co2 increase? Temperature precedes the co2 rise. As the earth warms due to solar and cosmic activity, animal life flourishes and emits co2. The warm periods in history coincide with major human accomplishments, further substantiating the theory.Science Fan wrote: ↑Tue Mar 20, 2018 9:26 pm If you look at the actual evidence, when we mathematically remove factors like the effects from an el nino, the relationship between greenhouse gas emissions and rising temperatures is nearly linear.
The coincidence is explained above, but what's unlikely is that something which constitutes .04% of the atmosphere could have a meaningful effect in light of the magnitude of the sun and galaxy.So, it's really hard to imagine that there is some other factor that is mainly responsible for the temperature rising, which just so happens to correspond to a nearly linear relationship between greenhouse gas emissions and temperature increases. The likelihood of that occurring is something like 0.
Science Fan wrote: ↑Sun Mar 11, 2018 11:02 pm The science behind climate change is actually fairly straightforward in its basics, and no science-denier has yet been able to refute a single aspect of it.
How do you know that? Can you explain to me the mechanism by which co2 insulates the earth? (hint: there is no such thing as reflection of EM waves)
I don't know about it either, would be interesting to learn the connections. But the oxygen levels after the Cryogenian seem to have suddenly skyrocketed, life suddenly diversified and 100 million years later this all seems to have concluded in the Cambrian explosion.
Again, they are totally unrelated.Greta wrote: ↑Mon Apr 02, 2018 1:46 am It's clear that sometimes species shape the Earth at times. It's now humans.
The blue-green algae definitely played a role in The Great Dying - there is no room for doubt, even if there were other factors. There was no free oxygen in the atmosphere until photosyntheisers emerged. That's how the atmosphere came to be oxygenated. Methanogenic organisms cannot tolerate oxygen so it's logical that most would have died out.
Yes, thanks, I used the wrong term - it was the Great Oxygenation Event when organisms triggered extinctions and transformed the Earth. The Permian was perhaps caused by vulcanism or maybe an asteroid impact, perhaps multi-causal, with perhaps even a contribution by methanogenic microbes.Atla wrote: ↑Mon Apr 02, 2018 6:48 amAgain, they are totally unrelated.Greta wrote: ↑Mon Apr 02, 2018 1:46 am It's clear that sometimes species shape the Earth at times. It's now humans.
The blue-green algae definitely played a role in The Great Dying - there is no room for doubt, even if there were other factors. There was no free oxygen in the atmosphere until photosyntheisers emerged. That's how the atmosphere came to be oxygenated. Methanogenic organisms cannot tolerate oxygen so it's logical that most would have died out.
The Oxygen Catastrophe happened ~2450 million years ago.
The Permian Great Dying happened ~252 million years ago.
I don't see how.
presicely!
????
agreed no relation.Atla wrote: ↑Mon Apr 02, 2018 6:48 amAgain, they are totally unrelated.Greta wrote: ↑Mon Apr 02, 2018 1:46 am It's clear that sometimes species shape the Earth at times. It's now humans.
The blue-green algae definitely played a role in The Great Dying - there is no room for doubt, even if there were other factors. There was no free oxygen in the atmosphere until photosyntheisers emerged. That's how the atmosphere came to be oxygenated. Methanogenic organisms cannot tolerate oxygen so it's logical that most would have died out.
The Oxygen Catastrophe happened ~2450 million years ago.
The Permian Great Dying happened ~252 million years ago.
back in the dark ages (1960s - lol) it was thought a comet, then later maybe a supernove, then today we blame the Dekken traps (Indian ocean volcanoes).......when we "don't know" we like to make it up.Greta wrote: ↑Mon Apr 02, 2018 7:17 am and transformed the Earth. The Permian was perhaps caused by vulcanism or maybe an asteroid impact, perhaps multi-causal, with perhaps even a contribution by methanogenic microbes.
http://www.slate.com/blogs/bad_astronom ... ction.html
Whatever, whether an extinction event is caused by geology or biology seems moot - it's happening and scientists are busily studying it.
How about Theia impact? That was about 80 times wider and maybe over a billion years older than Biggen, and you don't need a satellite (or even to take a road trip) to see the mark it left behind. This Theia hypothesis is not fully accepted, but I see nothing competing except a very young Earth rotating too quickly for stability.