Earth's Greatest Climate Mystery: Why Ice Ages Return Every 100,000 Years — Full Documentary

[00:00:00] Speaker 1: throughout Earth's history ice has repeatedly swallowed entire continents only to retreat again in a vast repeating rhythm the remarkable part is that this cycle has returned with almost uncanny regularity roughly every 100,000 years could such a colossal transformation truly be driven by nothing more than subtle shifts in Earth's orbit and axial tilt or is there something science has yet to fully unravel during the period scientists call the last glacial maximum our planet looked dramatically different from the world we know today in north america an enormous sheet of ice known as the laurentide ice sheet covered nearly all of canada and extended deep into the northern united states in many places it reached thicknesses of more than three kilometers comparable to the height of entire mountain ranges today under that immense weight earth's crust itself was forced downward by hundreds of meters meanwhile greenland and antarctica already frozen landscapes became even colder their ice sheets expanded and thickened locking away enormous quantities of the planet's water in solid form and this vast accumulation of ice triggered one of the most dramatic geographic changes in earth's recent history large portions of the northern hemisphere transformed into cold tundra a harsh environment where vegetation remained low growing seasons were extremely short and winter temperatures could plunge below minus 40 degrees celsius yet astonishingly this landscape was still full of life herds of woolly mammoths woolly rhinoceroses ancient bison and wild horses roamed the vast frozen grasslands known as the mammoth steppe one of the most biomass rich ecosystems of the ice age the ice age ecosystem had reached its peak yet it also marked the beginning of its decline opening a turbulent new chapter at the end of the ice age and just as the last traces of the ice age gradually faded away an even greater question emerged is earth moving toward a new ice age or have humans altered a natural cycle that has endured for millions of years at the end of the ice age across the cold grasslands stretching from siberia to north america there existed a vast ecosystem that scientists call the mammoth steppe it was one of the most productive ecosystems ever to exist on earth where herds of woolly mammoths weighing up to six tons wandered across frozen plains woolly rhinoceroses ancient bison and the giant deer megaloceros with antlers spanning up to 3.5 meters formed a wild world not unlike modern africa yet set within a harsh icy climate in the americas about 72 percent of megafauna species animals weighing more than 44 kilograms when extinct in australia the number was even higher reaching roughly 88 percent iconic ice age animals such as the mammoth mastodon the saber-toothed cat smilodon and the giant ground sloth megatherium disappeared one by one from the fossil record what happened one major hypothesis suggests that the primary cause was the extremely rapid climate change at the end of the ice age as the massive ice sheets began to melt global ecosystems transformed at a pace rarely seen in earth's global temperatures rose by roughly four to five degrees celsius within only a few thousand years a dramatic shift on a geological time scale as the climate grew warmer and more humid vegetation patterns changed and familiar food sources disappeared giant mammoths which required hundreds of kilograms of plant matter each day suddenly faced a world changing faster than they could adapt around the same time a new species began spreading across the continents homo sapiens the first groups of hunter gatherers migrated across the bering land bridge roughly 16 000 to 20 000 years ago and rapidly spread throughout the americas they carried with them a simple but remarkably effective technology sharp stone tipped spears known today as the clovis culture archaeological sites in north america have uncovered numerous mammoth and mastodon fossils bearing clear marks of hunting tools some skeletons still contain stone spear points embedded in their ribs this shows that ancient humans did not merely live alongside these giant creatures they hunted them a single adult mammoth could provide more than three million calories of energy enough to feed a human group for weeks for prehistoric hunters such an animal represented an enormous resource yet today many researchers believe that the extinction at the end of the ice age was not caused by a single factor warming climates altered habitats ecosystems shifted rapidly and humans with their intelligence and tools became a new pressure within an already fragile system the last surviving mammoth populations lived on wrangle island in the arctic ocean the lastworm until about 4 000 years ago at the same time the first pyramids of egypt were being built remarkably all of these events are preserved not only in fossils earth itself as one of these events but the earth itself has also silently kept evidence of the past beneath its vast ice sheets specialised drilling systems can penetrate more than three kilometers into ancient ice sheets when an ice core is brought to the surface it looks like a long transparent crystal tube filled with countless tiny air bubbles so it's not only a few days ago but those bubbles are ancient air trapped in the ice tens of thousands sometimes even hundreds of thousands of years ago so it's not only a few days ago [00:10:37] Speaker ?: so it's not only a few days ago so it's not only a few days ago [00:10:39] Speaker 1: but those bubbles are ancient air trapped in the ice tens of thousands in these microscopic bubbles scientists can determine the exact concentrations of carbon dioxide methane and other greenhouse gases that existed in the past from that information they can reconstruct the climate conditions of earth during different periods of its history but embedded between the layers of ice are extremely fine dust particles carried by winds from distant deserts during colder and drier climatic periods the amount of dust in the atmosphere increased significantly and traces of it remain preserved in the ice scientists can measure these dust concentrations to determine when the climate became harsher sometimes the ice layers also contain ultra fine volcanic ash from ancient eruptions however one of the most powerful tools for decoding ancient climate lies in something even smaller the oxygen isotopes within water molecules water on earth is not entirely identical some water molecules contain lighter oxygen isotopes while others contain heavier ones the ratio between these isotopes changes depending on the temperature of the climate when the snow originally fell by measuring this ratio in each ice layer scientists can estimate earth's temperature At the time that layer formed, Earth's climate does not remain constant. It fluctuates in large cycles. Our planet appears to shift between two major states. Long glacial periods lasting tens of thousands of years and shorter, warmer intervals known as interglacial periods. And when scientists analyzed the data more closely, they discovered something remarkable. Ice ages seem to occur in cycles of roughly 100,000 years. But what could control such a rhythm? The answer may lie beyond Earth itself. In the motion of our planet as it travels around the sun. In the early 20th century, a Serbian mathematician proposed a bold idea, that small variations in Earth's orbit could be driving the timing of the ice ages, a concept now known as the Milankovic Cycles. In the early 20th century, a Serbian mathematician and astronomer named Milutin Milankovic proposed a bold idea. According to Milankovic, the orbit of our planet slowly changes over time under the gravitational influence of massive planets such as Jupiter and Saturn. Jupiter and Saturn. These variations are extremely small, but they unfold over tens of thousands of years, long enough to influence Earth's global climate. Milankovitch identified three major astronomical cycles that could affect the amount of solar radiation reaching Earth. Over a period of roughly 100,000 years, the orbit shifts between being nearly circular and becoming more noticeably elliptical. When the orbit becomes more elongated, the distance between Earth and the Sun changes more dramatically throughout the year, altering the seasonal distribution of solar energy received by the planet. The second cycle involves the tilt of Earth's axis, known as obliquity. Today, Earth's rotational axis is tilted about 23.5 degrees relative to the plane of its orbit around the Sun. This tilt is what creates the seasons on our planet, but the angle of that tilt is not fixed. When the tilt becomes larger, the contrast between summer and winter grows stronger, especially at higher latitudes. The third cycle is even more subtle. It is known as precession, the slow wobble of Earth's rotational axis. If you have ever watched a spinning top, as it begins to slow down, you may notice that its axis starts to trace a small circle. Earth behaves in a similar way. The axis of our planet does not simply remain tilted. It slowly rotates in a conical motion through space, completing a full cycle roughly every 26,000 years. What ultimately matters is how solar energy is distributed across seasons and latitudes. In particular, scientists have realized that summer conditions in the high latitudes of the northern hemisphere play a decisive role. Each small orbital variation can change the amount of solar radiation reaching high latitudes by only a few percent. Remarkably, when scientists compared Milankovitch's orbital calculations with data from ice cores and ocean sediments, they discovered that these cycles align strikingly well with Earth's climate history. Although the 100,000-year eccentricity cycle matches the rhythm of recent ice ages, its direct effect on solar energy is too small to trigger a global ice age on its own. When scientists began comparing ancient climate data with the astronomical cycles proposed by Milankovitch. Over roughly the past 800,000 years, Earth's ice ages appear to follow a repeating rhythm of about 100,000 years. The planet enters a long glacial phase that lasts tens of thousands of years, then warms relatively quickly, and the cycle begins again. At first glance, this seems to perfectly confirm Milankovitch's theory. [00:20:06] Speaker ?: In the world, this is a new model. [00:20:09] Speaker 1: Among the three major orbital cycles of Earth, one aligns almost exactly with this number. Eccentricity. The roughly 100,000-year cycle in which Earth's orbit shifts between being nearly circular and slightly elliptical. Yet, eccentricity cycles do not significantly change the total amount of solar energy Earth receives. The variation in sunlight is far too small to directly transform an entire planet into a frozen world, where ice sheets several kilometers thick spread across continents. Some researchers believe that within Earth's climate system, even very small orbital changes can trigger a chain reaction of feedback processes. This change in the landscape can influence how ice flows, how much sunlight the surface reflects, and even how atmospheric circulation behaves. Scientists also suspect that orbital cycles may alter the way the oceans store and transport heat. When the climate cools slightly, the oceans can absorb more carbon dioxide from the atmosphere. As atmospheric carbon dioxide declines, the greenhouse effect weakens, allowing the climate to cool even further. Yet, despite these ideas, no single explanation is completely simple. Earth's climate system behaves like an intricate machine composed of the atmosphere, oceans, ice sheets, land, and the biosphere. What deepens the mystery even further is another discovery from ancient climate records. During earlier phases of the ice age, cold and warm cycles repeated roughly every 41,000 years, a period that matches almost perfectly with the cycle of changes in Earth's axial tilt. What caused the global climate system to shift its rhythm so dramatically? Earth's rotational axis is not fixed. It slowly oscillates between about 22.1 degrees and 24.5 degrees relative to the plane of its orbit around the sun. This cycle of variation takes roughly 41,000 years. This means that during the early stages of the ice age, Earth's climate system appears to have responded directly to the 41,000-year cycle of axial tilt. Ice ages became longer, colder, and more intense. Massive continental ice sheets began to persist for longer periods before melting. The warmer phases, known as interglacials, became shorter, almost like brief pauses between extended frozen epochs lasting tens of thousands of years. Scientists refer to this event as the mid-Pleistocene transition, or MPT. Remarkably, this transformation unfolded gradually over a span that would feel immense on a human timescale. Yet in the geological history of the planet, it was little more than a blink of an eye. So what caused the global climate system to change its rhythm? Some researchers suggest that the continental ice sheets in the northern hemisphere gradually became thicker over multiple glacial cycles. Ice sheets several kilometers thick could deform the Earth's crust beneath them, forcing the surface of the continents to sink under their immense weight. Another hypothesis involves dust in the atmosphere as climates became drier. Dust from expanding deserts could increase and be carried across the planet by winds. Dust from expanding deserts could increase the Earth's crust. When these particles settled onto the surface of ice sheets, they reduced the ice's ability to reflect sunlight, allowing the ice to absorb more heat. Another hypothesis suggests that deep ocean circulation itself changed structure. - Small shifts, in how cold water sinks to the ocean floor and moves through deep basins, could alter the way heat is stored and redistributed across the planet. - Many scientists believe that this shift emerged from the interaction of multiple climate mechanisms. Ice sheets, oceans, atmosphere and orbital cycles, all influencing one another in complex ways. - As researchers continued analyzing ancient climate records, they began to realize that understanding this transformation requires looking at another powerful planetary mechanism. - A mechanism capable of amplifying small climate variations into enormous ice ages. - That mechanism lies in the bright white surface of the planet itself, known as the ice albedo feedback. - To understand this mechanism, we first need to grasp an important concept in climate science: albedo. - Albedo is the ability of a surface to reflect sunlight. A dark surface, such as the ocean, or a dense forest, absorbs most of the sun's energy. A bright surface, like ice or snow, reflects most of that energy back into space. - Imagine a summer in the northern hemisphere tens of thousands of years ago. - If for some reason the summer became slightly cooler, part of the winter snow would fail to melt completely. - That remaining snow would persist into the following year, and the year after that. - And over time, the accumulated snow layers would compress and gradually turn into ice. - As the area covered by ice expands, the planet's overall albedo increases. - Earth absorbs less solar energy, and global temperatures begin to fall even further. - Modern climate models show that even a small initial change, - Such as a reduction of a few watts of solar energy per square meter at high latitudes, - can be greatly amplified by the ice albedo feedback. - For this reason, ice albedo feedback is considered one of the most powerful amplification mechanisms within Earth's climate system. - But this mechanism does not operate alone. - As ice expands, it triggers additional changes. - Winds shift direction. - Ecosystems transform. - And most importantly, the oceans begin to respond. - The oceans do not simply cover 71% of Earth's surface. - They also store about 90% of the heat within the climate system. - When the global climate begins to cool, the oceans change the way they absorb and redistribute heat. - At the same time, the composition of the atmosphere also begins to change. - Data from ancient ice cores show that during glacial periods, - Atmospheric carbon dioxide concentrations dropped significantly. - As carbon dioxide declines, the greenhouse effect weakens. - Allowing the planet to lose even more heat to space. - What causes carbon dioxide levels to fall so dramatically during ice ages? - And how can the oceans, with deep currents flowing kilometers beneath the surface, - help control the temperature of an entire planet? - To find the answer, scientists must look deeper into another part of Earth's climate system. - When scientists analyzed the ancient air bubbles trapped inside ice cores from Greenland and Antarctica, - they discovered a remarkably consistent signal. - During glacial periods, atmospheric carbon dioxide concentrations dropped dramatically, - from about 280 parts per million during warmer periods, - to roughly 180 parts per million at the coldest stages of the ice age. - Carbon dioxide acts like a thin blanket surrounding Earth, - trapping part of the heat the planet receives from the sun. - But what caused carbon dioxide to fall in the first place? - The answer lies in the oceans, which contain roughly 38,000 gigatons of carbon, - about 50 times more than the atmosphere, - and store nearly 90% of the planet's excess heat. - Colder water allows carbon dioxide to dissolve more easily. - As the oceans cooled, they drew carbon out of the atmosphere, - and transported it into the depths of the sea. [00:34:33] Speaker ?: - But the process is not simply about dissolving gas. [00:34:36] Speaker 1: - It is also connected to a vast global circulation system known as the Atlantic Meridional Overturning Circulation, - or AMOC. - Often described as the ocean conveyor belt. - This circulation system transports enormous amounts of heat from the equatorial regions toward the north. [00:35:07] Speaker ?: - And that's a huge amount of heat from the ocean. - That's a huge amount of heat from the ocean. - It's a huge amount of heat. - It's a huge amount of heat from the ocean. - This is a huge amount of heat from the ocean. - And the ocean is currently on the ocean. - It's a huge amount of heat. - It's a huge amount of heat from the ocean. [00:35:15] Speaker 1: - It's a huge amount of heat from the ocean. - It's a huge amount of heat. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. [00:35:24] Speaker ?: - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. [00:35:32] Speaker 1: - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. - It's a huge amount of heat from the ocean. [00:35:38] Speaker ?: - It's a huge amount of heat from the ocean. [00:35:39] Speaker 1: - Reveal that temperatures in Greenland once rose by as much as 8 to 10 degrees Celsius within only a few decades. Only to drop rapidly afterward. At the same time, when ocean circulation patterns shift, the ocean's ability to store carbon also changes. - More carbon becomes trapped in deeper waters, causing atmospheric carbon dioxide levels to fall. When we look at the bigger picture, it becomes clear that ice ages are not the result of a single factor. - They emerge from the interaction of many systems: planetary orbits, reflective ice surfaces, greenhouse gases, and the deep oceans slowly circulating beneath the surface. - The melting of ice and the rapid warming that followed transformed ecosystems across the planet. - Frozen grasslands vanished, forests expanded, and many of the giant animals of the ice age, once dominant across the continents, began disappearing from the history of life. - For more than 2.6 million years, Earth's climate system has operated like a vast astronomical clock. The slow orbital cycles of our planet, along with shifts in ice sheets, oceans, and the atmosphere, have worked together to produce the rhythm of ice ages that repeat roughly every 100,000 years. - But when we look toward the future, an extraordinary question begins to emerge. - Will this natural cycle continue as it has before? According to climate models based on Milankovic theory, Earth is currently in an interglacial period, a warm interval between two ice ages. - Yet today's climate system no longer resembles anything seen in the past 800,000 years. - Modern atmospheric monitoring stations show that global carbon dioxide concentrations have surpassed 420 parts per million. What stands out is not only the number itself, but also the speed of the change. On a geological timescale, this shift is almost instantaneous. - Carbon dioxide is a powerful greenhouse gas that traps part of the heat energy Earth receives from the sun. As carbon dioxide concentrations rise, the planet retains more heat. Modern climate models suggest that high carbon dioxide levels could weaken the conditions necessary for ice sheets to begin forming again in the northern hemisphere. For most of Earth's history, climate has been controlled by immense forces. The movement of continents, volcanic activity, and slow variations in Earth's orbit around the sun. - These processes unfold over millions of years. Yet, within only a few centuries, human industrial civilization has begun altering the composition of the global atmosphere. - We are not merely living in an interglacial period. We may be living in an entirely new phase of Earth's climate system. [00:41:09] Speaker ?: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:41:17] Speaker 1: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:41:23] Speaker ?: - We may be living in an entirely new phase. [00:41:24] Speaker 1: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:41:30] Speaker ?: - We may be living in an entirely new phase. - We may be living in an entirely new phase. 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[00:41:47] Speaker 1: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:42:06] Speaker ?: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:42:11] Speaker 1: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - Earth has shifted between frozen worlds and warmer intervals. - These cycles shape the geography of continents. - The evolution of life. - And ultimately the emergence of humanity. - And the greatest question still lies ahead. - Whether we are only a small chapter in Earth's climate story. 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We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:52:01] Speaker 2: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:52:18] Speaker ?: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - 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We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:56:56] Speaker 2: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. [00:57:06] Speaker ?: - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase. - We may be living in an entirely new phase.