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History, Geography, & Military Discuss Mass Extinction: Life at the Brink at the Political Forums; It has happened 5 times so far in earth's history. Is it possible we are in number 6? This is ...

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Old 02-11-2018, 03:14 PM
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Default Mass Extinction: Life at the Brink

It has happened 5 times so far in earth's history. Is it possible we are in number 6?

This is the question being asked by Science today...
Do a bit of searching and some studying and join in with what you found..


................... Mass Extinction: Life at the Brink.

....................................... Watch Videos _ View Images

It's death on an unimaginable scale, when a majority of Earth's species quickly die out. It's called "mass extinction," and it's happened at least five times before. Cataclysms, such as supervolcanoes or asteroids, are thought to cause these events, but some experts believe a manmade mass extinction could be next. Is our planet in trouble? And if so, is there anything we can do to stop the next catastrophic annihilation? Experts are traveling the world, performing groundbreaking scientific detective work to answer these very questions.

............... Use site to watch shorter video's related to this question.

https://www.smithsonianchannel.com/s...rink/0/3413789

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ALSO See


Endangered species The Observer

The Earth stands on the brink of its sixth mass extinction and the fault is ours


The rate at which vertebrate species are dying far exceeds the norm

Life on Earth is in trouble. That much we know. But how bad have things become – and how fast are events moving? How soon, indeed, before the Earth’s biological treasures are trashed, in what will be the sixth great mass extinction event? This is what Gerardo Caballos of the National Autonomous University of Mexico and his colleagues have assessed, in a paper that came out on Friday.

These are extraordinarily difficult questions. There are many millions of species, many elusive and rare, and inhabiting remote and dangerous places. There are too few skilled biologists in the field to keep track of them all. Demonstrating beyond reasonable doubt that any single species is extinct is arduous and painstaking (think how long it took to show – to most people, at least – that Loch Ness probably does not harbour a large monster).

And it’s not just a case of making a head-count of modern extinctions. This needs to be compared with a long-term “baseline” rate of extinctions in our planet’s long geological history. This can only be extracted via the equally painstaking and difficult work of excavating and identifying millions of fossils from the almost endless rock strata. Not surprisingly, different studies made so far on different fossils have yielded different baseline rates.
Humans creating sixth great extinction of animal species, say scientists
Read more

Caballos and colleagues have thought through these difficulties, and come up with probably the most robust estimate yet of how severe the modern crisis is.

They have been deliberately conservative – they’re well aware of the dangers of crying wolf on a topic of such importance, and where passions run so high. For a start, they limit themselves to the best-studied group of organisms, the vertebrates. Then, they take a high estimate of background extinctions to compare with, to make the modern figures as undramatic as possible. And then, they either consider only those animals known to be extinct (the “highly conservative” scenario), or they add in those extinctions in the wild that are likely to have happened, but are not yet verified.

Even with this caution, the figures are still shocking. Rather than the nine extinctions among vertebrates that would be expected to have occurred in normal geological circumstances since 1900, their conservative estimate adds in another 468 extinctions,
............................................... CONTINUED AT

https://www.theguardian.com/environm...cience-warning
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Old 02-13-2018, 04:30 PM
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Default Re: Mass Extinction: Life at the Brink

Well I don't know, but just in case, I'm going to have a cold beer and smoke a fattie to get ready.
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Old 02-14-2018, 01:05 PM
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Default Re: Mass Extinction: Life at the Brink

The two and a half hours I watched this documentary which was f[Illed with facts, if I was younger would have made me think longer over i]t all. But like the Dog Man at our age[/I][/I] well it isn't so damn scary..

So pass that fat joint around..................
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