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PostPosted: Sun Jul 29, 2012 2:46 pm 
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this is an interesting documentary that is influential in both environmental concerns and animal concerns but is actually on the topic of a dead zone in the palaeontology records between the proto-reptile-mammal creatures and the age of the dinosaurs (later).

http://www.youtube.com/watch?v=wn62AjIpWMw


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PostPosted: Mon Jul 30, 2012 1:14 am 
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It is too bad that so much evidence was lost due to oceanic plate subduction. A "day" geologically can be 10,000 years or an event of a short period with aftermath of centuries, like an impact. The time frame goes well with a very large ocean asteroid impact in the "Nemesis" time frame. Being near the middle now, it was 9 (26.3 million year) cycles ago, and the large sea bottom crater subducted and remelted into the upper mantle. It was the worst with 90% of species gone extinct. It is interesting that that is close to what is probable with the human caused AETM "event".
The group of cyanobacteria that created our oxygen atmosphere which killed most of them off . Here is an interesting take:
http://io9.com/5853522/a-plausible-end+ ... thought-of
Extract:
" You may not realize this, but for almost 2 billion years of the 4.5 billion year history of Earth, our planet's atmosphere was dominated by methane and other greenhouse gases. There was no free oxygen, and therefore no life as we know it could survive. But then, about 2.35 billion years ago, microbes called cyanobacteria — also known as blue-green algae — began to produce free oxygen as a byproduct of the photosynthesis process. The algae did this by breaking apart water molecules during their digestive process, freeing the O (oxygen) from H2O (water).

As a result, these cyanobacteria poisoned the world. At least, that's how it would have seemed to all the microbes around them, known as stromatolites, who breathed methane. Suddenly, all this oxygen was in the air and the stromatolites began to die out. Eventually the oxygen-based atmosphere allowed life as we know it (including humans) to evolve. Over the dead bodies of those methane-breathing stromatolites."
Actually, it killed most of the cyanobacteria, too, like how yeast kills itself. They ODed on their own waste.

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PostPosted: Mon Jul 30, 2012 1:23 am 
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our planet's atmosphere was dominated by methane and other greenhouse gases. There was no free oxygen
This fact always makes me laugh at the attempts to find planets with earth-like conditions (oxygen and liquid water) before considering looking for possible alien life.


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PostPosted: Mon Jul 30, 2012 2:00 am 
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Well. the interest is in a place humans could live, because it won't be that long before Earth is unlivable for most species.
I can't see all the expense just to look for life, when life can live in so many harsh and alien-like conditions even right here.
Humans probably wouldn't make it on a planet like this one was over 65 million years ago. Check for dinosaur like creatures and unknown diseases that humans would have no immunity for--that would take tech we will not have, probably ever.

With the Nemesis bombardments growing weaker, I wonder how many more of them there will be. Humans won't be here anyway.

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"With every decision, think seven generations ahead of the consequences of your actions" Ute rule of life.
“We do not inherit the earth from our ancestors; we borrow it from our children”― Chief Seattle
“Those Who Have the Privilege to Know Have the Duty to Act”…Albert Einstein


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PostPosted: Mon Jul 30, 2012 8:25 am 
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I hear there is a company sending some folks to Mars for the rest of their lives, I believe sometime in the 2020's. Better get your ticket now, they're only sending 10.

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PostPosted: Sat Aug 25, 2012 2:25 am 
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An amazing cinematography and a splendid direction . This documentary talks about the Permian era .


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