The Last Time the Globe Warmed

  • Опубликовано: 4 дек 2017
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    Imagine an enormous, lush rainforest teeming with the Arctic. Well there was a time -- and not too long ago -- when the world warmed more than any human has ever seen. (So far)
    Produced in collaboration with PBS Digital Studios:
    Special thanks to Nobumichi Tamura for allowing us to use his work:
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Комментарии • 4 883

  • Robby S
    Robby S 3 часа назад

    The world's gonna end in 12 years!
    *Still takes airplanes*

  • Danielle Hardy
    Danielle Hardy 6 часов назад

    I’m glad pbs put this together for viewing. Hopefully people will educate themselves instead of running with hand fed information.......

  • Iakovos
    Iakovos 14 часов назад +1

    If one takes the anthropogenic climate change paradigm off the table, the most likely and almost certain cause of changes to temp over time is sun activity, full stop.
    Temperature variance has been observed, directly tied to solar activity.
    Cue pitchforks and shouts of 'heresy!!!'

  • Mauricio Marroquin
    Mauricio Marroquin 15 часов назад

    If GlObAl WaRmInG wAs ReAl ThEn WhY iS mY fReEzEr CoLd?
    *Killed so many brain cells typing like that*

    • Iakovos
      Iakovos 15 часов назад

      ...and, obviously, so few to spare.

  • daniel higgins
    daniel higgins 16 часов назад

    Extrapolation is the least accurate scientific method. Everything this little fella is saying is theory based on extrapolation. The main variable he can’t accurately use in his theory is the sequence of events, 50 million years ago. IE: which came first, the CO2 dump or the warming?

  • Caspian Lee
    Caspian Lee 22 часа назад +2

    I agree with you, 56 million years ago is not long ago.

  • Al Nino
    Al Nino День назад

    As Jerry Seinfeld would say. (Things CHANGE! )

  • Anthony Joyce
    Anthony Joyce День назад +2

    All those damn 4 wheel drives and power stations a million years ago. Sorry, forgot the farting bovines.

  • fredkuhn165
    fredkuhn165 День назад +2

    Too many cows farting, but we used to have over sixty million bison roaming naturally so....

  • John Carter
    John Carter 2 дня назад

    He seems to totally ignore what we know about the eccentricity of the earth's orbit. Meaning that the tilt may be eccentric but it is consistently and measurably so and that seems to have a lot of effect on temps.

  • collapsingquantumwav
    collapsingquantumwav 2 дня назад

    If you are from Liberty University, you couldn't understand these facts.

  • peter gbrics
    peter gbrics 3 дня назад

    1000 years ago was warmer on earth than it is today...

  • ENRG
    ENRG 3 дня назад +1

    Anyone else feel like they are realizing the earth getting warmer isn’t that bad? Feel like people are making earth getting warm a terrible thing

    • Jakob Pesl
      Jakob Pesl 9 часов назад

      It's bad
      Very bad
      How can you not realize that it would change the world as we know it today to a far worse place

  • Allothersweretaken
    Allothersweretaken 3 дня назад

    Is this what ppl call the medieval warm period? Or is this something different?

  • Jess Fulbright
    Jess Fulbright 3 дня назад

    The last time the earth warmed was the Medievil Warm Period; from approximately 900 to 1300 AD. During this period England had vineyards that rivaled France and the Vikings colonized Greenland. Oxygen isotope studies in Greenland, Ireland, Germany, Switzerland, Tibet, China, New Zealand, and elsewhere, plus tree-ring data from many sites around the world all confirm the presence of a global Medieval Warm Period that was significantly warmer than present day. Unlike the hell predicted by the current global warming conspiracy theorists almost all species, especially humans thrive during these warm periods. Just look back at real history and you will see that overall this is true, consider the Roman Warm Period from 250 BC to 400 AD or the current warm period from 1715 to 1916, humans did very well during both periods. It is the cold periods that reduce populations.

  • Damien Phillips
    Damien Phillips 3 дня назад

    I’d love it if you all did an episode on the evolution of insects.

  • James Armstrong
    James Armstrong 3 дня назад +1

    Doesn't really know what caused heating or cooling of earth - I think it was that yellow ball in the sky since that is where all of our warming comes from. The earth moves in an elliptical but not the same orbit each rotation plus the sun spots increase heating because of a lack of a thermostat.

    • Charles Roberts
      Charles Roberts 2 дня назад

      You know that there's such a thing as AN ATMOSPHERE and all of the OTHER regulating factors that tend to balance things out. People that think like you are worst than CAVE MEN, "big thing up in sky we call "sun"!" "Lack of thermostat", what a DIM WIT, Pfzzzt! Didn't graduate grade school did we, James.

  • Mark Kmiecik
    Mark Kmiecik 3 дня назад +1

    It hasn't warmed for the last time yet!

  • Neutri no
    Neutri no 3 дня назад +2

    Global warming won't kill planet Earth. Sooner or later she will be beautiful again. It will kill us...

    • Spacedoutdolphin
      Spacedoutdolphin 3 дня назад

      We can hope. But it is likely. Let’s hope we don’t cause another huge extinction. Oops says the humans.

  • Jonas Keß
    Jonas Keß 3 дня назад

    Real question: Is it really that bad if some of our citys go underwater and other places like greenland and russia or canada are more filled with live and places to farm then nowadays. More or less the space we have stays the same, some animals will go extinct, others will grow in population and maybe even new forms of life will evolve.
    I understand that there is global warming coming, i just dont understand the big problem with it.
    Humans will change the area they live in any way they like and wont have any problems. And we are not moraly bound to safe other animals or plants whatsoever. And thinking humans will go extinct in the future because of temperature is crazy and nonsense. And with the theory of the survival of the fittest, the fittest will manage to adapt and change and the weakest will die. The same way it always was and always will be, why the big fuzz.

  • RicoLen1
    RicoLen1 3 дня назад +2

    We'd like those animals to stay where they are today; very progressive.
    Little did this guy know that in 2016 the globe would start cooling and has been doing so ever since. Turns out the Sun has a LOT to do with the temperature of the Earth and sunspots have a much more drastic effect on global temps than a very mild greenhouse gas like CO2. Either way I'd very much like to see what comes next. I like change, I don't fear it.

  • Juan Diego Vasquez
    Juan Diego Vasquez 3 дня назад +5

    Thank you, Curiosity Stream.

  • Maverick Hargrave
    Maverick Hargrave 4 дня назад

    The deal with climate change is not that "the Earth is in danger" or anything. The Earth will be fine. Humans, on the other hand, will be extinct if the climate warms up.

  • Jon Gillette
    Jon Gillette 4 дня назад

    Oh please! How long will it be until I don't have to drive 16 hours to the ocean! Plant a tree save a dope. Plant a dope... Well just plant a dope.

  • slade beck
    slade beck 4 дня назад

    I’m sure with our human genius we will adapt and make whatever world we find ourselves in our home.

  • Brian Boru
    Brian Boru 4 дня назад

    So more complex lifeforms thrived, and more primitive ones suffered. Sounds like humanity will probably benefit from global warming.

  • Dalton K
    Dalton K 5 дней назад

    I think it’s crazy how much scientists know but there’s people who deny the shape of the earth, space travel, and evolution etc.

  • Rebecca Knight
    Rebecca Knight 5 дней назад +2

    There are not any missing links that determine things changed into something else by the way. Some species just survived extreme changes to our world. Just because one thing resembled another does not mean it was something else first and then morphed into what we see today. There are no missing links. If there are then prove it. I want to see physical proof of all the billions of morphing fossils that truned into the hummingbird or the butterfly or??? There should be billions of fossils to prove this and there are non.

  • Andy MacDonald
    Andy MacDonald 6 дней назад

    The sooner harsh winters are replaced with warm weather the better.

  • Jesse Lane
    Jesse Lane 7 дней назад +4

    Someone just said "is there something wrong with you?" because I'm interested in this

  • Herman Cain
    Herman Cain 7 дней назад

    and it was THE END OF THE WORLD!!! AAAAAAAAH!!!!! Oh wait...

  • HerpyDerpyZ
    HerpyDerpyZ 7 дней назад +1

    Petm More like Temp

  • Edward Orem
    Edward Orem 7 дней назад

    Man, ah caint hardly stan ta listen ta uppity prim8s.

    GONMAD 8 дней назад +4

    What wasn't brought up was pole shift & meteor strikes causing atmospheric changes almost instantly.

    METTEWBA2BA 8 дней назад

    0:29 far...

  • Luizinho Caron
    Luizinho Caron 9 дней назад +2

    CO2 in the atmosphere and GHG? Really? Come on!

    JOHN LONGENECKER 9 дней назад +2

    To solve Global Warming - elect new rational leaders

  • Renagade5150
    Renagade5150 10 дней назад

    So if I do my math correctly, we have roughly 600 years before we get to equal the thermal maximum. That's considering we have been producing high levels of CO2 since ohhh the late 1800's, and that we will peek in our CO2 emissions in roughly 30 years. Give or take a decade. I think we'll be able to tackle the problem in the intervening 6 centuries....

  • DiDi
    DiDi 10 дней назад +2

    It gets hot, it gets cold. Always has, always will. It's 2019 and we're having non stop blizzards all over the northern hemisphere. The earth is getting cooler and this is just the beginning of an ice age. The earth always cleanses and renews itself.

  • Michael Frankowiak
    Michael Frankowiak 11 дней назад +2

    Could of been a lot of factories, cars and cows that warmed the planet a million years ago :) lol

  • owen suppes
    owen suppes 11 дней назад

    I just want to point out that the Eocene maximum was not the same baseline we are dealing with in today's Holocene maximum( the narrator mentioned this as well). So comparisons of emissions and radiative forcing only go so far in informing projections.

  • Nick Rudd
    Nick Rudd 11 дней назад +2

    Buy a house on a hill top and fit Aircon and a big old fire place. Should be sorted then.

  • Andrzej
    Andrzej 11 дней назад +3

    I like when this guy talks to me.

  • Rave
    Rave 13 дней назад

    you are an American tax funded channel making videos for a fan base that is majority american and you use Celsius in your video? how rude, stupid, and selfish.

    • He said
      He said 12 дней назад

      +Rave Trust me most of the viewers are not Americans lol.

    • Rave
      Rave 12 дней назад

      +warren munroe i actually developed a way to do the conversation in my head. its the principle. American tax funded channel making videos for a fan base that is majority American. Again how rude, stupid, and selfish.

    • warren munroe
      warren munroe 12 дней назад +1

      Maybe you should brush up on your Celsius.

  • Danfeegs
    Danfeegs 13 дней назад +1

    How do you become an Eontologist? I am an undergrad geology major.

  • BKS duskmirror
    BKS duskmirror 13 дней назад

    NASA say ice increase in the South Pole in the last 10 years. Look it up, all the data is on NASA website

    • He said
      He said 12 дней назад

      Over all it's still a decrease.

    • Imperial Dork
      Imperial Dork 13 дней назад +1

      it spread outwards but the total amount is less

  • George George
    George George 14 дней назад +2

    well, back then the slow shift of climate has allowed the environment to adapt and move with the climate in a change over thousands of years. When we are talking about this rate of change within a century, almost nothing will stand a chance to adapt!

  • jack wardley
    jack wardley 14 дней назад

    so could this be happening again now and it's not us causing the warming ?

    • jack wardley
      jack wardley 14 дней назад

      so looks like we going to have to move crops north but banks are still giving long term loans in miami london etc these no clause in any contract about rising sea levels and from insurance companies you would think if they were that concerned these smart people would put that clause in there faster than the speed than the speed of light.

    • Frederik Sandberg
      Frederik Sandberg 14 дней назад

      No, this time it's happening because of us, and the acceleration of the changes are much worse.

  • 09111973 {}{}
    09111973 {}{} 14 дней назад

    I knew they were trying to reinstate the plaocene

  • Jeb Atman
    Jeb Atman 16 дней назад

    Carbon Dioxide? Built up that much that long ago? But I thought they said our cars and cows' farts increased those numbers?

  • Mr Jones
    Mr Jones 16 дней назад +3

    Humans could easily survive in an environment like the one during the PETM. But our current civilization will not survive a artificially induced rapid transition to a PETM like environment. Not in its current form.

    • MasNeoh
      MasNeoh 4 дня назад

      Mr Jones but will we ALL survive is the question? I think not

  • Frostlast
    Frostlast 18 дней назад

    the time is NOW old man

  • Дмитрий Аверьянов
    Дмитрий Аверьянов 19 дней назад

    Back then plants and animals had enough time to adapt to rising temperatures but it is not the case now

    • Imperial Dork
      Imperial Dork 13 дней назад

      +jean cul exactly, speak, trolls, greenland and the structure of your sentences

    • jean cul
      jean cul 13 дней назад

      +Imperial Dork i don't speek with trols !

    • Imperial Dork
      Imperial Dork 13 дней назад

      +jean cul ok i can see that english isnt your native language, and i would like you to try again

    • jean cul
      jean cul 13 дней назад

      ​+Imperial Dork It's juste Groenland, 2 millions km2. Its juste one place LOL !
      Listen informations about NorthGRIP high resolution analyses. The climate change in short time because the winds change.
      The winds change mean ALL the North emisphere climate change.
      And the climate is a local climate, it's stupid to say +100° in north emisphere and -100° in sud emisphere is the same thing if the grow is 0° for the earth.

    • Imperial Dork
      Imperial Dork 13 дней назад

      +jean cul samples from one location, its not a change in the world climate unless its in more than just one place

  • Robert S
    Robert S 19 дней назад +1

    Why did the planet cool? Is it a self correcting system?

    • Lyri Metacurl
      Lyri Metacurl 18 дней назад

      There should be a video on that, it was epic. Basically the Arctic was a giant pond (a.k.a. the Arctic Pond), with freshwater on top, and this one species called Azolla (basically tiny lily pads) grew ALL OVER IT and sucked out 80% of the CO2 from the atmosphere, triggering massive global cooling. I found this video (we are currently watching) by searching for Azolla.

  • Alex Klein
    Alex Klein 19 дней назад

    So what did we learn? Climate change is a self correcting problem. It's all happened before, it'll all happen again.

    • D Brown
      D Brown 15 дней назад +1

      +The Goddamn Batman exactly.

    • The Goddamn Batman
      The Goddamn Batman 15 дней назад +2

      +Alex Klein I'd suggest watching the video again but it would be like explaining what a light year is to an idiot.

    • The Goddamn Batman
      The Goddamn Batman 15 дней назад +2

      +D Brown I know. he totally missed the point of this video.

    • Alex Klein
      Alex Klein 16 дней назад

      +D Brown explain.

    • D Brown
      D Brown 16 дней назад +2

      Ignorance is your friend I see.

  • The Stress Theory of Hans Selye
    The Stress Theory of Hans Selye 20 дней назад +2

    His presentation is specious. What he overlooks is the effect of Pangaea, the "supercontinent" that stretched from the north pole to the south pole and disrupted the air currents and ocean currents that distribute heat around the planet. The disruption of these heat dissipating air and ocean currents was the underlying cause of this period of dramatic "global warming" in which the polar ice caps melted completely, and terrestrial temperatures and ocean temperatures became abnormally hot. The resulting hot climate accelerated evolution and produced adaptations to the hot climate.
    As the various continents moved toward one another to form Pangaea, some of them initizlly experienced increasing cold. At that time animal life was dominated by amphibians and reptiles, and plant life was dominated by gymnosperms. As the climate grew colder, the reptiles developed gigantic "sails" that helped to capture sunlight to facilitate warming their bodies to optimize physiological function. As the climate grew still colder, a new "stress mechanism" appeared via modifications of the reptilian physiology: the mammalian stress mechanism. It involved a few small changes that greatly enhanced survival and function in the cold climate: 1. a change in red cell morphology that suppressed systolic turbulent flow resistance and enhanced exercise tolerance and 2. euthermic metabolism that prevented lipoprotein solidification below 100 degrees Fahrenheit. These changes in the underlying stress mechanism explain the visible anatomical and behavioral differences between mammals and reptiles. These "Proto-Mammals" (actually they were the same mammals of today) became the dominant predators during this period of cold climate.
    Later, as the various land masses merged into the supercontinent and disrupted air and ocean currents so as to cause dramatic increases in prevailing temperatures on land and in oceans, there was a mass extinction of both marine and terrestrial life forms that were unable to tolerate the hot climate. The hot climate did not suit the stress mechanism of mammals, which became small in size (the better to dissipate body heat) and retreated to the remaining cool climates. Meanwhile, archosaurs evolved from reptiles via a new cardiorespiratory physiology that utilized a four-chambered heart and accessory air sacs in the abdomen, chest, and hollow bones. When these animals inhaled air, half of the fresh air went to their lungs, while the other half went to the accessory air sacs. When they exhaled air from their lungs (typically from their rear end) they simultaneously suffused their lungs with fully oxygenated air from the air sacs. This enhanced their exercise tolerance as well as their bouyancy, and they became the "top predators" of Pangaea. They thrived in the vast, shallow, warm inland seas of Pangaea in the form of mosasaurs, ichthiosaurs, plesiosaurs, monitor lizards, alligators, and crocodiles. Meanwhile angiosperms evolved from gymnosperms and became the dominant terrestrial plant stress mechanism.
    Dinosaurs evolved from archosaurs via alterations in the archosaur stress mechanism that enhanced their exercise tolerance, but they remained poikilothermic, so that their food intake was applied to growth and not wasted on maintaining body temperature. The prevailing terrestrial temperature remained above 100 degrees, above the melting point of lipoproteins, for some 500 million years, during which dinosaurs became the dominant terrestrial predators. However their stress mechanism could not tolerate water, which rapidly removes heat from the animal body. Dinosaurs utilized feathers to retain body heat at night, when cooling temperatures undermined their exercise tolerance and survival.
    The dinosarus became extinct after some five episodes of partial extinction as the supercontinent began to break up into the continents that we know today. The mosasaurs, ichthiosaurs, and plesiosaurs became extinct as the warm shallow salt water seas of Pangaea disappeared. The alligators, crocodiles and monitor lizards endured. At present they are mis-classified as reptiles, but they are far more energetic than reptiles.
    Mammals thrive and extend their ranges during periods of global cooling, while poikilothermic reptiles and archosaurs thrive and extend their ranges during periods of global warming. During the present epoch of "global warming" mammals are in retreat, while reptiles and archosaurs are getting bigger and extending their territories. Duh.

    • Magnus Peacock
      Magnus Peacock 5 дней назад


      Just no.
      Wrong time period.
      200 million years wrong.

    • Mairwen 99
      Mairwen 99 15 дней назад

      Stress Theory, You're absolutely right.

    • Ali Abdullah
      Ali Abdullah 19 дней назад +1

      Firstly Pangea didn't exist then (it existed 335 MYA this event started 52MYA)

      Secondly, if Pangea did exist at this time period then what would explain it lasting only 200,000 years and not 160MYA( Pangea lasted that long)

      please fact check before you post

  • John Vane
    John Vane 20 дней назад

    I continue to be confused as to why the peak temperatures in the 1930s have disappeared off the global temperature record, why the cooling of the early 1970s has gone astray and why the temperatures taken from static weather stations in undeveloped country areas that haven’t been moved in 100 or more years now have to be adjusted (increased) to correlate with temperatures taken in heavily built up areas. The normal way to do things would be to take the unaffected data and use it as the standard but that of course wouldn’t show a warming trend of .06 degrees Celsius a decade. By the way I would like someone to explain how that .06 degrees is measured within the realms of human and machine error, particularly in the 90 years or so prior to digital technology. When I flew in the Air Force we provided weather information to Air Traffic Control along with our position reports which, because Hercules are one of the few aircraft that fly international and trans continental routes between 18000 feet and 30000 feet, tended to provide a considerable amount of the real time information for that altitude band. Outside air temperature is measured directly from static probes on aircraft and in most aircraft all of the temperature gauges are repeaters fed off the one probe. It was not unusual, however, to have both gauges on the aircraft to differ by a degree or more - that tends to instil a degree of scepticism in a person.

    • meliosexe Animations
      meliosexe Animations 15 дней назад

      John Vane could be that world class scientists had better stuff than you had in the military

  • Trigger Troll
    Trigger Troll 20 дней назад +1

    Taxed into submission . Biggest threat to humans.

    • Imperial Dork
      Imperial Dork 13 дней назад

      i wont go bankrupt if my arm breaks

  • Moe F.
    Moe F. 20 дней назад +1

    College is a scam!

  • Rick TD
    Rick TD 20 дней назад

    CAGW is a huge scam !!

  • Clark Magnuson
    Clark Magnuson 20 дней назад

    Hank should be ignored about climate until he gets his credibility back.

    • Imperial Dork
      Imperial Dork 13 дней назад

      +Clark Magnuson on what video

    • Clark Magnuson
      Clark Magnuson 13 дней назад

      +Imperial Dork
      When he abandoned scientific method for politicized climate prediction models.

    • Imperial Dork
      Imperial Dork 13 дней назад

      +Clark Magnuson wen did he lose his credibility?

    • Clark Magnuson
      Clark Magnuson 20 дней назад

      +James Huggett "keep your inflammatory statements to yourself" you seem angry.

    • James Huggett
      James Huggett 20 дней назад

      What are you talking about I don't think he ever lost his credibility if so please explain otherwise keep your inflammatory statements to yourself

  • wes c
    wes c 21 день назад

    So, what needs to happen to keep our climate from changing? I've always been told we are overdue for another big climate change by about 7 hundred years.

    • Imperial Dork
      Imperial Dork 13 дней назад

      "due for a climate change" climate change isnt just an event that happens one year, its a slow process

    • sweiland75
      sweiland75 19 дней назад

      The one where Americans don't exist.

  • Peg Leg
    Peg Leg 21 день назад

    The forests which used to absorb and sequester the CO2 have been cut down by humans. The inconvenient truth is, only getting rid of the humans will solve the problem.

  • Annaliese Cameron
    Annaliese Cameron 21 день назад +1

    Love, love, love your videos. :)

  • Stephen Donaldson
    Stephen Donaldson 21 день назад +2

    If we could time travel into the past, what would be the safest historical period for humans to live (no modern weapons etc etc).

    • Imperial Dork
      Imperial Dork 13 дней назад

      +Mairwen 99 so humans arent even responsible for the cancer people got from co2

    • Stephen Donaldson
      Stephen Donaldson 15 дней назад

      +Mairwen 99 err umm it was just a innocent question, not intended to be more than a thought bubble. Not sure why it gets such a respone.

    • Mairwen 99
      Mairwen 99 15 дней назад

      Stop being so bloody anthropocentric! Humans are of no account whatsoever. In fact, quite the reverse. You are brainwashed.

    • Stephen Donaldson
      Stephen Donaldson 17 дней назад

      +Andrew Darby dang! I was thinking after 5pm that day. In front of the fire in the pub...

    • Andrew Darby
      Andrew Darby 17 дней назад

      After extensive research into the answer of this question I have I have concluded that Sunday, 22nd April 1873 between the hours 13:00-17:00 - [PROVIDING] you were taking tea in the gardens of the Anglican rectory in a small village in Cheshire, England. Of course, there could have been other locations also.

  • BKS duskmirror
    BKS duskmirror 22 дня назад

    It's called climate variation, it change all the time. Don't even try to understand until you can predict what will happen in the next 6 month.

    • Imperial Dork
      Imperial Dork 13 дней назад

      +BKS duskmirror overall the poles are losing ice

    • BKS duskmirror
      BKS duskmirror 13 дней назад

      Imperial Dork
      The North Pole will lose ice, while the South Pole will gain more of it. Snow will cover the south and the north will see rain, the icy land will green up and feed on CO2, animal will thrive, farm land will produce more food. People up north will be able to swim in a once frozen lake. And finally the climate will change again, and for the next six month we will hope and pray for the next northern global warming

    • Imperial Dork
      Imperial Dork 13 дней назад +1

      in the next six months from now it will be getting warmer in the northern hemisphere and colder in the southern one

  • MrRaisinBran
    MrRaisinBran 23 дня назад

    I really hate how foreshadowing this episode is.
    We're on the edge of the next great dying and we're just going to let it happen.
    Humanity is a fantastic, brilliant, tragically horrible, ignorant species.

    • James Griscom
      James Griscom 20 дней назад

      Let her RIP. Don't worry, we'll all be living on Mars and Titan so the Earth can heal itself

  • life42theuniverse
    life42theuniverse 23 дня назад

    4:58 unfortunately while man made carbon emissions are a great recipe for growing more trees and plant life in more diverse regions around the globe as it warms we(human industry) have increasing demands on carbon products and will just chop them down as quickly as these new forests spring up. :\

  • Dave Frame
    Dave Frame 23 дня назад


  • Jesse Scott
    Jesse Scott 24 дня назад +4

    Thank you for explaining the reality of the PETM. The magnitude and causes of the PETM (with no humans factors) sure is an inconvenient truth when bounced against modern day anthropological global warming alarmists

    TIKI TIKI 24 дня назад +1

    , you are a great narrator, thank you

  • blake102989
    blake102989 25 дней назад

    No.... The earth is reversing poles so its only getting warmer at the poles. It is actually getting colder at the equator

  • highlights Bottle flip nbanflnhl
    highlights Bottle flip nbanflnhl 26 дней назад +2

    The last time the earth warmed like today was the roman warming period around 2000 years ago, humanity flourished. It flourished during the midevil warming period 1000 years ago as well. So why are we jumping the shark?

    • Imperial Dork
      Imperial Dork 13 дней назад

      +Mairwen 99 search "medieval warming period" and go to images

    • Mairwen 99
      Mairwen 99 15 дней назад

      well exactly, my view entirely.

  • Cédric Benoit
    Cédric Benoit 26 дней назад

    Stay where they are today

  • OldPossum
    OldPossum 26 дней назад +7

    This is great! I shall soon have palm trees in my yard. I'll go burn some tractor tires to speed this along.

    • Imperial Dork
      Imperial Dork 13 дней назад

      just hope you are far from the sea

  • Aaron P
    Aaron P 27 дней назад

    .... Why is there no recommend videos under this one.....

  • Andy Appan
    Andy Appan 27 дней назад

    GHGe 120 PPM

  • Rusty yB
    Rusty yB 27 дней назад

    Hmmm was the carbon rise just a feature of what ever happed to turn the world into a PTEM hothouse? ... The contemporary temp rise quoted is not seen in raw temp data but instead adjusted temperature data.

  • Nathan Cortes
    Nathan Cortes 29 дней назад

    Chemistry's not real science because it's all explained by physics.

  • Joey Wall
    Joey Wall 29 дней назад +1

    Earth is such a strange planet.

  • johnlocke445
    johnlocke445 Месяц назад

    But why didn't life on Earth become extinct from this warming? Life seemed to thrive in this environment. I'll bet you there were a lot of companies burning fossil fuels to get the world this warm.

    • Imperial Dork
      Imperial Dork 13 дней назад

      because it happened reaaaaly slow

  • Michael Stephenson
    Michael Stephenson Месяц назад

    Not once does he mention that South America was still connected to Antarctica, so there was no circumpolar current. Also the isthmus of Panama had not formed yet, so the Atlantic and the pacific oceans could mix freely. It’s odd that the video is so heavily biased towards co2, when the continental arrangements had heavy effects on the climate.

    • Kenny
      Kenny День назад

      Apparently, when they say they don't know what started the era or ended it, you just stopped listening.

  • Joe OConnor
    Joe OConnor Месяц назад +4

    The methane coming from politicians will set this ball on fire

  • Dean Gamelin
    Dean Gamelin Месяц назад

    I thought that PBS was from the U.S. where we use fahrenheit.

  • highlights Bottle flip nbanflnhl
    highlights Bottle flip nbanflnhl Месяц назад

    We humans have experienced two very similar warming events to the one we see today, occouring around every thousand years from roman times to the midevil warming period to guess what it's right on cue for the next one its been a thousand years people. Sorry to rein on your parade.

    • Imperial Dork
      Imperial Dork 13 дней назад

      search "medieval warming period" and go to images

    • MRGRUMPY53
      MRGRUMPY53 29 дней назад

      HaHaHa…..No way.

  • Justin Rees
    Justin Rees Месяц назад

    Many of these climate change videos show conflicting points of view...not sure who to trust. In the meantime I’m still not in favor of the government taking control of my life.

    • MRGRUMPY53
      MRGRUMPY53 29 дней назад

      Go back to school.

  • rodge911
    rodge911 Месяц назад

    The Roman warm period and Midevil warm period were considered great times for humanity with longer growing seasons and less drought. The Dark Ages were a cooler time and not considered to be a time of great human advancement.

    • rodge911
      rodge911 5 дней назад

      +Imperial Dork Did it, I found this graph showing the Vikings colonized Greenland during that period.

    • Imperial Dork
      Imperial Dork 13 дней назад

      search "medieval warming period" and go to images

  • Britishshooter
    Britishshooter Месяц назад +1

    Err, what about the Medieval Warming Period? OK 'only' 11 degrees warmer but came to an end in less than 200 years so........

    • Imperial Dork
      Imperial Dork 13 дней назад

      11 degrees, where did you get that figure you mad man

    • Mairwen 99
      Mairwen 99 15 дней назад

      The Mediaeval Warm Period lasted longer than 200 years. it began well before the Great Conquest and lasted up to the early 14th century.

    • MRGRUMPY53
      MRGRUMPY53 29 дней назад +1


  • Eric Neale
    Eric Neale Месяц назад

    Great video. Cant wait for the earth to warm up and for there to not be so much snow. Cant wait for more rainforests.

  • Richard BENNETT
    Richard BENNETT Месяц назад

    Different nuclear signature, not different chemical signature for carbon-13 compared to carbon-12.

    • Hannes Nykänen
      Hannes Nykänen 29 дней назад

      Water that is 36 degrees Celsius can absorb roughly three times more CO2 than water that is 0 degrees C. So I wonder how the sees could have contained more CO2 when the water was 36 degrees.

  • Photosounder
    Photosounder Месяц назад

    "The Last Time the Globe Warmed" it was around the 10th century CE which enabled Vikings to settle in Greenland and even visit Canada.
    But of course Hank Green has to go back 56,000,000 years to drive the point home that "omg u guise our global warming is just the same thing, panic now!!"

    • Imperial Dork
      Imperial Dork 13 дней назад

      search "medieval warming period" and go to images

  • Antonio Calhau
    Antonio Calhau Месяц назад

    Thanks you so much. I am speechless. Brief but spectacular, absolutely!

  • Britanny Helms
    Britanny Helms Месяц назад +1

    I love all the experts in the comment section. lmao

    • MRGRUMPY53
      MRGRUMPY53 29 дней назад

      Most are High School dropouts.

  • 1956Johnk
    1956Johnk Месяц назад

    One thing that seems to be missing is places that show tropical growth were closer to the equator back then. Much of this suggests today's location of land masses and that can be deceptive.

  • Curtis Densmore
    Curtis Densmore Месяц назад

    Talk about chemistry during the Hadean.

  • Curtis Densmore
    Curtis Densmore Месяц назад

    Ignore the metric snobs. If your goal is to educate, you should provide metric and imperial units. I'm sorry that I was raised on Imperial and therefore have a better sense of what a Fahrenheit temperature feels like.

  • Perahoky
    Perahoky Месяц назад

    how is it possible that plants survive the polar night if there are rain forests at the poles ?

  • Dave Trindel
    Dave Trindel Месяц назад

    Interesting, if the equatorial water was 36c, why didn't the water vapor released not result in thermal runaway? Water is vaporizing at that temperature. Also, wouldn't this result in acidic rain with the higher carbon?? I hope that this is not found to be more than a post event news report on only a few conditions that we can see. To try to avoid it, is in itself Humans trying to alter the environment. I think the conclusions are k, but well supported as being finite more than any other guess. Just it sounds astute because there are numbers mixed in, though I think one would be hard pressed to prove, based on what was presented, to know if the carbon was the cause or effect of other factors, or the resulting heating.

  • al zollinger
    al zollinger Месяц назад

    The real problem we should discuss is pollution not climate change!
    warming/cooling whatever, is within the natural range which could be
    set for the past 2,5 million years ( Gelasium, a generally cooler period
    in earth's history.) CO2 is vital for organic growth and has absolutely
    no effect on temperatures. All scientists get this wrong. Temperatures
    vary, then CO2 follows, with a lag of a few hundred years. H2O vapor
    makes the earth a living place and the sun's actvity causes variation to
    the climate. CO2 is just an indicator: warmer periods subsequently
    yield a higher CO2 ppm count. Simple as that. The real threat to nature
    is mankind and its pollution.

  • Elliander Eldridge
    Elliander Eldridge Месяц назад

    what made the cyanobacteria more successful than halobacteria?
    The chlorophyll of cyanobacteria became the basis of nearly all photosynthesis on Earth forming the foundation of our ecosystems. This I know because the genetic fingerprinting I conducted of Spirulina showed a common ancestor with the chloroplasts of terrestrial plants. What I don't know is why the retinal of halobacteria never did the same that we know of.
    If plants were made with Halobacterial organelles rather than cyanobacterial organelles plants would be absorbing more green light and reflecting such light that they would appear to range between crimson red and purple.