How Many Times Has The Earth Experienced An Extinction Event? | The Next Great Event | Spark

Earth’s history has been marked by five great extinction events. With the current background extinction rate 1000 times the normal, have humans brought about the 6th mass extinction? The changes our species has wrought upon Earth, its ecology & climate, has led geologists to compare us to a geological force akin to volcanoes, and terming this era the Anthropocene period (“Anthropo” meaning ‘human’). Will it witness the greatest loss of biodiversity ever? What does the fast-changing climate mean for the future of humans? Experts weigh in on these questions in this documentary.
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[JonnoPlays]

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

[matane]

"Extinction is the rule. Survival is the exception."
-Carl Sagan

[TitanicSubGoBoom]

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.

[deeya]

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.

[esshor.]

….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.

[stretchnj]

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

[qarljohnson]

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

[geoffreyblankenmeyer]

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

[KnowledgeCat]

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

[latheofheaven]

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.

[michaelclark]

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.

[davidbonner]

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?

[iota]

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

[MikeCCO]

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 !

[SciHeartJourney]

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.

[mrCetus]

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

[halsnyder]

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.

[jennymichie]

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 a lot. It's terrifying.

[carterfrady]

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.

[acase]

I thought root structure help to stop erosion