The Last Time the Globe Warmed

  • Published: 05 December 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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  • Science and Technology Science and Technology

Comments • 8 404

  • Audrey Harper
    Audrey Harper  17 hours back

    The Earth's biomass and oceans release 10 - 15 times more CO² than what we produce annually. Besides climate change doesn't only happen because of green house gasses but also because of rotation, solar activity, etc. and right now we're living in a solar maximum which means that temperatures will continue to rise steadily for decades or even hundreds of years from now.

    • JoJo C
      JoJo C  1 days back

      Volcanoes was and is the answer

      • BiffTannen2015
        BiffTannen2015  1 days back


        • E S
          E S  1 days back

          To me this just proves global warming is a natural thing, but it’s making some people a lot of money. We are definitely speeding it up but it’s coming no matter what we do.

          • Moris Zebua
            Moris Zebua  2 days back

            So global warming is not preventable right? Why human try to stop it?

            • Yours Truely
              Yours Truely  3 days back

              0.7 global. Ahum. mercury thermometers have a 1 degree accuracy and then there is the human mistake factor. Hadcrut Global warming began when the landstations were taken out.

              • lasagna 4layf
                lasagna 4layf  3 days back

                0:33 o o f

                • Kroba Commander
                  Kroba Commander  3 days back

                  My new fav!

                  • Ed Spencer
                    Ed Spencer  4 days back

                    Medieval Warm Period. 950-1250, warmer, global, multiple research papers on it. Then the IPCC tried to erase it because it raises too many questions about the current agenda.

                    • Leon Cosgrove
                      Leon Cosgrove  4 days back

                      You say that CH4 (Methane) is more potent and CO2 so melting permafrost releasing more methane and CO2 gases. But this you go and put up this debate on CO2 is the warming agent and also this debate on acidic changes to the sea water. You have a lot of assumptions and perhaps in your language in this short film. There a lot of inaccuracies as well in the timing of events in this video. Also, It is interesting all the C based gas increases are natural in the PETM but you now attribute all current C base gas emissions to human factors. Just be honest you just don't know and so therefore you should theorize on this topic. Just report the facts and not you ideas.

                      • Edgy Guy
                        Edgy Guy  4 days back

                        so Earth won't turn into a new Venus with all life gone? okay then.

                        • Barry Renouf
                          Barry Renouf  4 days back

                          What a load of baloney.

                          • Jason Loghry
                            Jason Loghry  4 days back

                            This is incredible. How can it have downvotes?

                            • scott left
                              scott left  4 days back

                              Imagine, a thermometer being invented in the early 1700's....amazing huh?

                              • Taylor White
                                Taylor White  2 days back

                                Is that question about whether or not temperature measurements before 1700 are inaccurate..?

                            • Paul cock
                              Paul cock  5 days back

                              Nice warm, I like it,

                              • GoodnKnuts
                                GoodnKnuts  5 days back

                                How am I supposed to believe some or most Scientist when they them selves can't even tell the difference between males and females? SMH

                                • Noah Amyot
                                  Noah Amyot  4 days back

                                  GoodnKnuts stfu you’re bringing politics into this; just listen to the people who are smarter that you unless you have hard evidence to go against their facts.

                              • R K
                                R K  5 days back

                                global warming sounds dope

                                • David Nicol
                                  David Nicol  5 days back

                                  I was interested in what he said, until he started the advertisement!

                                  • Knuckles Dragon
                                    Knuckles Dragon  5 days back

                                    Gee. A cyclical environmental warming cycle that happened on its own just like it's happening now. Who would have thought it?

                                    • Wasa Bista
                                      Wasa Bista  6 days back

                                      By the way don't bother donating to PBS. They get oodles of Rockefeller money.

                                      • Tim Henry
                                        Tim Henry  6 days back

                                        Imagine if we could change the climate on purpose. I'd make it so I could grow oranges in Ohio. We can't change the climate. We are the climate.

                                        • Andrew Sanford
                                          Andrew Sanford  6 days back

                                          We all gonna die

                                          • brujonagual
                                            brujonagual  6 days back

                                            What about the holocene climatic optimum?

                                            • N20Joe
                                              N20Joe  6 days back

                                              They ended that warming period by forcing all surviving creatures to give all their money to politicians, exactly the same way they propose to end the warming this time!

                                              • WizardOfAus
                                                WizardOfAus  6 days back

                                                Happens every summer

                                                • Casey Ferguson
                                                  Casey Ferguson  6 days back

                                                  It's amazing how we know all of this. Yet none of us were alive then

                                                  • Gr8 bAnD1t0
                                                    Gr8 bAnD1t0  5 days back

                                                    Geology is an awesome subject as well as paleoanthropology.

                                                • puzzone putrefatto
                                                  puzzone putrefatto  7 days back

                                                  A unkown advanced civilization caused this.

                                                  • Amar Dave
                                                    Amar Dave  7 days back

                                                    So basically thanks to man, crocs are about to make a massive comeback in the rainforests of the world!

                                                    • Robert Black
                                                      Robert Black  1 weeks back

                                                      Too much hype. No one knows how active the sun was in the Eocene, and the Sun provides all the heat the Earth gets. No amt of greenhouse gasses can warm the planet, since the Earth doesn’t generate its own heat. All comes from the sun. The Solar flux is not constant, as the 11/22 yr sunspot cycle shows, and we seem to be in a Grand Solar minimum like last occurred 1645 - 1715, when the Earth was excessively cold. Should such a prolongued minimum occur now, it just might tip the climate into another Ice Age, since we do not know the cause of such events, nor how long they last.

                                                      • rransomm
                                                        rransomm  1 weeks back


                                                        • Alexandre Lollini
                                                          Alexandre Lollini  1 weeks back

                                                          How agriculture decoupled CO2 and later methane from quaternary glacial / interglacial alternance from astronomical forces circa 10 000 years ago ?

                                                          • Jude Angione
                                                            Jude Angione  1 weeks back

                                                            Great clip. Glad I've found you. What I am most interested in now is looking at continental drift combined with climatology, planetary science, botany, etc. to get a better picture of how continental drift over hundreds of millions of years directly contributed to distribution of plants and animals around the world - which you do touch on here. Also, very interested in what the world was like when the sea levels were much lower and whether the sea rose bit by bit or by cataclysm. Looking forward to exploring this channel. Also, very interested in human migration.

                                                            • Tulsa Fox
                                                              Tulsa Fox  1 weeks back

                                                              How come nobody mentions the Sun or the other planets we're doing at this time they are talking about in global warming videos just saying

                                                              • Johnny Apple Seed
                                                                Johnny Apple Seed  1 weeks back

                                                                Maybe, maybe it was soap poisoning.......
                                                                Theories are like arseholes, everyone has one.

                                                                Continental Drift??.....Or has earth's Continents been in the exact same position from it's creation?

                                                                • Super Man
                                                                  Super Man  1 weeks back

                                                                  The globe is currently at about 400 ppm in CO2, and has increased by only about 140 ppm since the start of the Industrial Revolution. 500,000 years ago CO2 was at about 2,000 ppm and the Earth was about 14 degrees hotter and life flourished. Even if we continued pumping massive CO2 into the atmosphere for the next 500 years Earth would absolutely habitable. In fact, it would be even more so than it is today. Global warming is not a problem, the politicization of science is the problem.

                                                                  • Pranav
                                                                    Pranav  1 weeks back

                                                                    "cLiMatE cHanGe HappEnIng nOw wIlL bE tHe eNd oF liFe aS wE kNoW iT"
                                                                    I for one, do not mind rainforests in Wyoming and Greenland. Much better than the desolate landscapes that are present there today

                                                                    • FinJproductions
                                                                      FinJproductions  1 weeks back

                                                                      @N A yeah true but most will die. Life will recover eventually but the rate species going exstinct in recent years is eqiverlant to a mass extinction

                                                                    • N A
                                                                      N A  1 weeks back

                                                                      @FinJproductions definitely not everything, there are enough living things that would survive and continue evolving giving rise to be animals etc

                                                                    • FinJproductions
                                                                      FinJproductions  1 weeks back

                                                                      There won't be any. Change happening this quickly won't give life a chance to evolve. It takes thousands of years not decades. Everything will just die out because it can't evolve quick enough

                                                                    • TheCreepnextdoor
                                                                      TheCreepnextdoor  1 weeks back

                                                                      yeah I for one want to take a scuba tour of Venice

                                                                  • Foo Shampoo
                                                                    Foo Shampoo  1 weeks back

                                                                    This is funny bc I got the wiki global warming explanation. Apparently pbs joins the ever lengthening list of bad content providers.

                                                                    • Peter West
                                                                      Peter West  2 weeks back

                                                                      I’m a self indulgent Canadian and can’t wait to have palm trees and tiki bars on the shores of Lake Ontario. 😆

                                                                      • frangitube
                                                                        frangitube  2 weeks back

                                                                        So It's all so natural. Hotter climate/colder climate...species going extinct, or evolving. Changes constantly taking place. Warming/cooling. Extremes during certain periods of history. Just as you'd expect.

                                                                        • juscurious
                                                                          juscurious  2 weeks back

                                                                          This video is wrong. The last time the earth warmed significantly was the Medieval Warming Period, approximately 850AD-1300AD. It was warm enough to grapes for wine production as far north as Scotland.

                                                                          • onlybugwit
                                                                            onlybugwit  2 weeks back

                                                                            If you spoke just a little faster, you would be totally incomprehensible

                                                                            • Bartlomiej Kasprzyk
                                                                              Bartlomiej Kasprzyk  2 weeks back

                                                                              In the medieval era.

                                                                              • Lima Bravo
                                                                                Lima Bravo  2 weeks back

                                                                                You forgot to mention the anoxic events which lead to modern oil deposits

                                                                                • Rowan O’neill
                                                                                  Rowan O’neill  2 weeks back

                                                                                  The amount of carbon in the ice is from the past would have to have a buffer between what was in the atmosphere/pressure over time, we don’t have ice from our era that we can compare in age so over millions of years the amount in ice found in the future could be a fraction of a fraction.

                                                                                  • Arkady Kholodenko
                                                                                    Arkady Kholodenko  2 weeks back

                                                                                    It is hard to rationalize the manner in which the content is presented. This should not be like commenting on car racing, horse racing, etc. But it delivered like that! This makes no sence to me.

                                                                                    • Kalyn Wyatt
                                                                                      Kalyn Wyatt  2 weeks back

                                                                                      I don’t know about you but would like to see the world fall apart and people be terrified while our species died off. We’re not really that great.......

                                                                                      • KEN ZEN
                                                                                        KEN ZEN  2 weeks back

                                                                                        Thes videos Nice stady ken do goods What wey vest ? yours

                                                                                        • Werner Schulz
                                                                                          Werner Schulz  2 weeks back

                                                                                          plant a tree - thats what it does!