I have UKposts Premium, but thanks to Spark I still get to watch ads.

I’m a delivery driver in metro Detroit and our sprawl is getting ridiculous. We are putting Walmart’s and strip malls in every field and forest within 75 miles of Detroit. In the past fifteen years since I started it has been dramatic. I drive past Canadian geese families all day long living around the fake run off evaporation ponds we build around these concrete slabs. These geese have been coming to these specific spots for thousands of years and we paved them over and they eat on the little patches of grass on the side of the road. They look homeless to me I feel so bad for them.

There's just something so bone chilling about The Great Dying. It's like the planet dodged a bullet by a hair's breadth, from becoming a dead rock like Mars.

It's incredible to think that this happened on the same planet we're on right now!

….why wasn’t the great oxidation event included on this list? The worst extinction event that killed off close to all prior anaerobic microscopic forms of life.

I think the Green lady has got her P's & Q's mixed up there, 4:00 Tree roots dont cause erosion to my knowledge, they prevent erosion by keeping the soil there !

Imagine all the different species that have ever existed.. Boy would I like to see each one in person.. May life live forever!!

Excellent explanations. I like the explanations

I am surprised by the low quality of information about the extinction events in this video. PBS Eons and many other UKposts science channels cover this topic much more accurate and concise.

Imagine that, earth has cycles of warming and cooling...........

Special thanks to the camera man who traveled in time to film everything.

Each geologic period ended with an extinction event. The others were not as severe as the Big Five.

The 252 million year old extinction event was associated with the Basalt from the Siberian Traps. Enough Lava came out to cover all the Earth 10 feet deep in basalt. The Antipode was in Antarctica where a very large impact event occurred. The one at 66 million years ago only has enough lava to cover the Earth a mere 3 feet deep. The antipode is the Chicxulub Impact event. Giant impact events fracture earth on the opposite side of the earth. The energy re-focuses at the antipode using reflection, and refraction of energy waves.

This is one of the most interesting documentaries I have ever viewed; also one the most frightening. I like the explanations of the past extinctions & when, not all the facts are not in, it is really made clear with some educated guesses.

Even small power outages can freak out small communities because people can’t get things from stores because the stores close down because you can’t pay with card or cash through their systems. People will freak out and lose their minds over the smallest things.

A constant state of flux always changing is the norm and I find it very interesting that people usually think of geology as the big determining Factor for Global change when there's another one that's at least as effectively as geology is when it comes to making global environmental changes and that is biology which is seldom discussed outside of the scientific community and I think we should maybe do something about changing that and bring biology into the public realm of discussion.

13:10. No no no! Lystrosaurus was not the ancestor of dinosaurs and mammals alike. Lystrosaurus was a synapsid, and synapsida is the group that gave rise to mammals. But dinosaurs were sauropsids. The two lineages had already split long before Lystrosaurus evolved.

I am looking forward to this one

Dang! Glad I'm here. (That one fellow looked familiar. Is that officer Jim Dangle, Reno 911?)

More people need to see this documentary. The most clear and concise recordings of cause and effect. I'm no eco-warrior...but we need to CHANGE. This made me cry and it's humbling. Thank you for being here to educate. Today, I don't want to bring a child into the world, because I'm scared..And people are doing..........not a lot. It's terrifying.

Watch this again with friends and do a shot every time they um uh probably think or maybe. It’ll be a very short night.😂

Aren't the "trees" mentioned at the beginning of the film the fruiting bodies of Prototaxites , one of the earliest terrestrial fungi? Don't miceilia (sp) hold soil thus help prevent erosion?

man these quality documentary my man. +1

definitely right there sir...

Very interesting! Well done!

“Unless conserved…” humans can be mindful but to think we can stop a mass extinction event is the pinnacle of arrogance

What a wonderful documentary

I love this video

This is the scariest video I've ever seen. My son came home from school saying he will not have children and I took it ,like most, you will change your mind one day. As an adult he tells me he would love to have children but won't because the world will change and he couldn't do that to them. It's heartbreaking truth this video is what he means

I’m very intrigued about this 🤔, but could be from the intriguinol I took this morning

Far better documentaries on this subject out there.

One of those videos that one should watch... and then watch again immediately.

I wonder if the asteroid had an effect on volcano activity? 🤔 It seems to me that the Earth is usually in balance keeping volcanoes in check most of the time. It seems reasonable to expect an increase in volcano activity shortly after the asteroid's impact. Like ringing a giant bell.

I thought root structure help to stop erosion

You have my Heart..

Amazing to think that this happened on the same planet we are on right now! 🌎👀

unbelievable to think that this happened on the very same earth we are on right now.

Excellent explanations of earth’s past & where we are now. New rock type made of plastic says it all for modern human life.

Best "Five Extinctions Content & Video Quality" I've seen! KUDOS!!

7:23 That dragon fly is like a alien the way it made a sharp turn

Denial, anger, bargaining, depression, extinction. We are still firmly rooted in denial.

5:17 Didn't realize Eddy Izzard was an expert on climate change. Great job Eddy...... Keep up the good work!

The odd thing about this... is its appeal to how we should perceive change over time - though it's the exact opposite of a rational perception regarding change over time.

Cue the "We're all gonna die in the next 10 minutes!" background music while they all head to Davos in private jets to present their latest papers.

Solid choice of experts/ professionals to opine on this topic. Thank you! Well done and pretty solid! Thank you again ❤

The Permian Extinction part forgot to mention the Siberian Traps. Hmmmmm.....

Nice documentary. Holly molly lady, the strongest accent ever!

Thank you so much for this. I so admire these scientists. Men and women at their most noblest. ❤

1st thing I notice about this channel is that there are no references linked in the description of the video.🤔

What humans do to earth is exactly how we describe and fear what aliens would do if they came here..... I think that fear is memory of what we did long before anyone can remember or has been recorded in history or forgotten.

Powerful 🥺

It is a great documentary .Thank you

How would trees cause extreme erosion and the loss of soil into the oceans? Looking for an explanation.

That was very informative and helped me realise the greater need for humans to work together.

Am I the only one that realized, nearly every single expert, seemed like they were struggling to articulate their thoughts??

If we're in the 6th great extinction then I have to work on my extinction pose 🤪😑😮‍💨😒😱. Great documentary 👍👍

Obviously, the Earth has always been on a knife edge. Plus, it is amazing how many changes have occurred. Also, the severity of some of the changes in very short time periods. Tragically, human self-interest will be paid for many times over.

4:19 large trees dug roots causing erotion... roots dont cause this, wind and water do, roots help hold ground not release it

Amazing video!!!

Prof Jeffrey Stilwell should work on a Jeff Goldblum impression! 5:17

I’m impressed that the nature of plant roots changed so much! Today plant roots are considered to stabilize soil and reduce erosion. I have NEVER before heard of plants increasing erosion. Seems an unsound hypothesis.

Dude... An extinction Level Event, is likely something we could never have any chance of avoiding or stopping...

At 22:24 he starts to talk about the current "perfect storm" of conditions and then adds "not just climate change induced by humans" and then starts to enumerate them, 'deforestation', 'urban sprawl', 'habitat fragmentation'... All, notoriously, 'induced by humans'

Strong work. Thank you.

Also, when plant life is overabundant, the atmosphere also gets to high a concentration of oxygen. But with that comes low CO2, which is a requirement for most all plants, which then die off since there's no food for them to continue growth. As they die off, the bacteria consume those and you'd get lts of CO2 again, and this can happen rapidly from a geological point of view, like every million years or so.

interesting, frightening, informative, engaging

Crocs survived!!!! There used to be so many different types and now we are limited...

Can someone clarify he said “ our current ice age”, so we are currently in an ice age ???! That’s wicked news

10:47 I found real life Butter's from South Park! The hair the face yeah Butter's

Life will undoubtedly go on , unfortunately the human race may not , and it’s no more than we deserve 🤷‍♀️

I never thought I would watch Al Bundy in a documentary about climate change.

Nice

Hi. Great work, especially the very long-term correlations between CO2 levels, temperature, and ice-melting. However there's one aspect of temperature rise I've never seen covered on a climate video, and that is "how much extra water evaporates in the tropics for each degree of temperature rise?" Obviously this is important, because if more water evaporates in the tropics than melts at the poles, the sea levels will go down, not up. Humidity, rain, and cloud cover will also increase, the latter reflecting away sunlight which will lessen global warming, but the humidity will increase it, like a heat trapping blanket. A major factor can be seen with a glance at any globe of the Earth: There is ten times as much area for evaporation in the tropics as there is area for melting at the poles. So which has the most powerful effect on sea levels, or have we reached a natural balance? I'd suggest that until we have some hard our computer models are no better than educated guesses. Confounding things further is that we use Mercator's two-dimensional projection of our three-dimensional globe, and this grossly distorts the relative sizes of polar areas and tropic areas, making the former look far larger than they are, and the latter smaller. We see a full width band of white at the top and bottom of the map and tend to panic when considering it all melting. It's more illusion than substance, but it still conditions our thinking with an unhelpful distorted perspective. A simple experiment could help sort this "melting versus evaporation" equation out. Make low flat-topped forty-foot triangular glass-houses, modelling the correct size dimensions of segments of the earth between the pole and tropics, and partially fill each with salt water. The bottom of each segment will vary according to the known contours of the sea floor, so the total quantity of water in the segments will be proportional to the oceans as well. Each triangle's apex, representing the polar area, would be chilled to the average Arctic or Antarctic temperature. These apexes will become mini- icecaps. The much wider bases of the triangles, representing the tropics, are heated to sea temperatures at the equator. Evaporating water at the base would migrate to the cold apex, and condense, as happens on earth now. This experiment could accommodate ocean currents, but it could not model weather air movements very well. It could at least give us a crude base of real-world knowledge. Computer models alone are not good enough, especially when they don't include measurements of evaporation. (Garbage in, garbage out.) Next, raise the temperature one degree C both at the poles and equators, then observe and measure. And so on. An experiment like this (but hopefully more sophisticated), could determine whether the hypothetical "tipping point" actually exists, and at what temperature it kicks in if does. Thanks for a very thought-provoking video, keep up the good work. Cheers, P.R.

the basic presumption at the video beginning is that man can actually do something about a polar shift, inbound asteroid, etc. Do I need say more?

This explains the #5 vision

"IGNORANCE IS BLISS" scary visions..

4:00 since when do trees roots digging into the soil cause erosion? Doesnt it hold the ground?

Can you make video about diffrent species of humans?

6:21 is that Butters, from south park? 😳

I never heard so little confidence from a scientist before

Almost random sound bite inserted "Lystrosaurus was the ancestor of both dinosaurs and mammals alike." Sorry but Lystrosaurus was a synapsid and could not have been the ancestor of dinosaurs.

How in the hell can you make such a huge mistake as to say Lystrosaurus was an ancestor of mammals and dinosaurs? It was ancestor to neither. It has no extant descendants, it's total line went extinct. Lystrosaurus shared it's last clade with mammals at Therapsida, and it's last shared ancestral clade with dinosaurs was Amniota. Lystrosaurus and the mammal line was Synapsida, it's sister clade was Sauropsida which leads to Reptilia and Dinosauria.

I love these videos because they focus on interesting and fascinating objective knowledge free from the fantasy politics getting spewed about everywhere else. Thank you.

Really fantastic video I love things on this topic

The UN need scientists to deep dive around the Indian ocean and find how much the huge Chinese fishing fleets have stripped the oceans of all marine life that is eatable

Wow what a great documentary. Thank you.

Mr. Burns from The Simpsons stated he was as old as Pangaea. Wonder what he experienced? 😂

No prizes for guessing whats going to cause the next extinction event.

This is such a powerful documentary. It just shows how fragile life is and how us apex humans are just so oblivious to what's accruing it's crazy. Makes me upset. Life is so complex. I love this kind of content. Smashing stuff spark. 👊

The scary background music convinced me these extinction periods actually occurred.

People need to limit themselves to only one child. Hard reality

Did I lose count? I thought they were going to discuss the “Five Mass Extinction Events.” They detailed 3, or maybe 4, then a geologist led a discussion on ecosystem collapse. And another scientist states, boldly, that the greatest threat to Earth is global climate change? I mean, climate change is worse than the fragmented comet that rained across the northern hemisphere for over two decades toward the end of the last ice age? Really? Wow. I actually subscribed here thinking I’d get some science.

The current ice age we live in has flip flopped between interglacial and glacial periods at least 17 times!

0:37 scp 001 when day breaks.

Gotta love the climate change context with the phrase "caused by human activities" on a video that cannot in any way possible involve human activity.

Never considered that 'extinct' might be chilling. After all, we wouldn't be here without it. Oh, well maybe that's the point.

And the explanation for the Devonian extinction was the destruction of oxygen in the world's seas by the spread of large trees into the interior of the land and whose "roots dug down into the soils and caused stream erosion" and "land plants (that) caused a lot more erosion by digging in their roots and causing nutrients to run off causing algae blooms which sucked oxygen" out of bodies of water. Plants that "dig in their roots" stabilize soil by absorbing water that otherwise would cause runoff. What did these people study to get this so ass-backwards?

60 minutes 3 days ago. We're in the 6th extinction now!

Or in the future when an A.I scientist is doing field research for his doctorate , he finds there was an anoully species that appeared for a short time between layers in the soils that make up the in between what would be considered a layer in time.

don't understand. they're saying the tree roots caused erosion? don't roots hold the soil in place, if not than what was the dust bowl all about than?