About 800,000 years ago Earth’s ice age cycle transitioned from being about 41,000 years long to about 100,000 years in duration. During a cycle, Earth’s ice coverage ranges from 10 percent of Earth’s surface to 20–23 percent. This transition, known as the Mid-Pleistocene Transition (MPT), may not seem important, but its highly improbable nature and especially what it means for human civilization has profound significance.

Importance of the MPT
Without the MPT global human civilization at more than a subsistence level would never have begun. More significantly, the MPT has allowed for the eventual existence of a high-technology population of billions of people to know and widely communicate the Creator’s ultimate message for humanity. How?

The MPT made possible warm interglacials, during which ice recedes closer to 10 percent coverage of Earth’s surface, and which last not just 2,000–3,000 years but up to 10,000 years. This allows enough time to launch and sustain global human civilization to a point where billions of humans can live on Earth at one time and possess the technology for everyone to hear and understand the Christian message of how Jesus Christ’s atoning death by crucifixion can reconcile them to their Creator. Two to three thousand years, especially with the temperature instability that was characteristic of the 41,000-year periodicity, would not give the necessary time.

A year ago, I wrote a series of three blogs on the miraculous nature of the MPT.1 In my forthcoming book, Weathering Climate Change, I offer a more complete explanation and description of the MPT.2 Now, a paper published in Nature affirms the conclusions that I drew about the MPT in my blogs and book.3

Eleven geoscientists, led by Princeton University’s Yuzshen Yan, report on their analysis of carbon dioxide and methane concentrations in ice core samples that date from 1.0 to 2.7 million years old. The deepest continuous ice core record of Earth’s past climate comes from EPICA Dome C in East Antarctica. This ice core contains the last 1.5 million annual ice layers. However, the bottom 700,000 layers have been under so much pressure from the top 800,000 layers as to pose a significant challenge to scientists’ attempts to determine a detailed and accurate chronology of Earth’s climate during those 700,000 annual layers. Consequently, EPICA Dome C so far has yielded a detailed, reliable climate record for only the past 800,000 years.

Old Ice Next to a Range of Hills
Recently, glaciologists have discovered old Antarctic ice that is near the surface and, hence, not subject to high pressures. In blue ice regions of Antarctica (the light-blue color results from the ice’s absorption of light and encased air bubbles) a combination of powerful ice flow against a range of high hills and surface ice loss by wind scouring and sublimation (ice directly transforming into water vapor) has brought old ice up near the surface. The Allan Hills region of East Antarctica is one such location (see featured image).

A U. S. Geological Survey team has drilled two ice cores to bedrock in the Allan Hills region. The lowest 30 meters of these cores is 2.7–2.0 million years old. However, for these parts of the cores the dating is uncertain and there is some evidence that layers of ice have been disturbed. Yan’s team determined, though, that the ice layers dating from 1.5–1.0 million years are pristine and yield accurate dates.

In the ice core layers dating from 1.5–1.0 million years Yan’s team carefully measured the abundances of carbon dioxide and methane and the ratio of deuterium (a heavy isotope of hydrogen) to hydrogen. The deuterium-to-light-hydrogen ratio is a proxy for temperature at the time the ice was deposited.

Models for the Transition
Measurements by Yan’s team showed that atmospheric carbon dioxide levels for interglacials both before and after the MPT were similar but that for the glacials they were, on average, 24 parts per million higher before the MPT than after. Yan’s team concluded that their measurements were inconsistent “with hypotheses that attribute the transition into the 100k [-year ice cycle] world to a long-term decline in both interglacial and glacial atmospheric CO2.”4 Instead, they stated that their measures affirmed models that link the MPT to:

  • decreases in atmospheric CO2 during glacial maxima caused by enhanced dust delivery to the Southern Ocean,
  • changes in global ocean circulation, and
  • greater ice sheet size over North America.

In an accompanying commentary Eric Wolff, an Earth scientist at Cambridge University, wrote that “these data force us to look elsewhere for the cause of the longer glacial cycles.”5 Here, Wolff indicates that the leading model explaining the MPT was a long-term decline in atmospheric carbon dioxide levels throughout both glacials and interglacials. However, recent papers published by interdisciplinary research teams that I cited in my three blogs6 have challenged this model.

Evidence for Fine-Tuning
Yan’s team’s findings are consistent with the conclusions I drew in my three blogs and book, with one important exception. I attributed the cause of the MPT to many more simultaneous factors than just the three above. In Weathering Climate Change I describe eleven other factors that also played significant roles.7 However, it appears that Yan’s team did not intend to be exhaustive in listing the causes of the MPT and the three they did list seem to be the most important.

I titled my blogs on the MPT “Miracles of the Mid-Pleistocene Transition” for a reason. The notion that possibly fourteen fine-tuned features of Earth’s ice age cycle simultaneously have combined to give humanity ideal living conditions seems highly improbable, even miraculous. Yan’s team’s research and measurements provide additional justification for the titles and for seeing a Creator’s interventions in Earth’s history to make possible the human story of creation, fall, and redemption.

Featured image: The Allan Hills Region of Antarctica
Image credit: U. S. Geological Survey

Check out more from Reasons to Believe @Reasons.org

Endnotes
  1. Hugh Ross, “Miracles of the Mid-Pleistocene Transition, Part 1,” Today’s New Reason to Believe (blog), October 1, 2018, https://reasons.org/explore/blogs/todays-new-reason-to-believe/read/todays-new-reason-to-believe/2018/10/01/miracles-of-the-mid-pleistocene-transition-part-1Hugh Ross, “Miracles of the Mid-Pleistocene Transition, Part 2,” Today’s New Reason to Believe (blog), October 8, 2018, https://reasons.org/explore/blogs/todays-new-reason-to-believe/read/todays-new-reason-to-believe/2018/10/08/miracles-of-the-mid-pleistocene-transition-part-2; Hugh Ross, “Miracles of the Mid-Pleistocene Transition, Part 3,” Today’s New Reason to Believe (blog), October 15, 2018, https://reasons.org/explore/blogs/todays-new-reason-to-believe/read/todays-new-reason-to-believe/2018/10/15/miracles-of-the-mid-pleistocene-transition-part-3.
  2. Hugh Ross, Weathering Climate Change: A Fresh Approach (Covina, California: RTB Press, forthcoming).
  3. Yuzshen Yan et al., “Two-Million-Year-Old Snapshots of Atmospheric Gases from Antarctic Ice,” Nature 574 (October 30, 2019): 663–666, doi:10.1038/s41586-019-1692-3.
  4. Yan et al., “Atmospheric Gases,” 665.
  5. Eric W. Wolff, “Ancient Air Challenges Prominent Explanation for a Shift in Glacial Cycles,” Nature 574 (October 31, 2019): 636–637, doi:10.1038/d41586-019-03199-8.
  6. Ross, “Miracles of the Mid-Pleistocene Transition, Part 1,”; Ross, “Miracles of the Mid-Pleistocene Transition, Part 2,”; Ross, “Miracles of the Mid-Pleistocene Transition, Part 3.”
  7. Ross, Weathering Climate Change, chapter 13 and the appendix.

 

About The Author

Dr. Hugh Ross

Reasons to Believe emerged from my passion to research, develop, and proclaim the most powerful new reasons to believe in Christ as Creator, Lord, and Savior and to use those new reasons to reach people for Christ. I also am eager to equip Christians to engage, rather than withdraw from or attack, educated non-Christians. One of the approaches I’ve developed, with the help of my RTB colleagues, is a biblical creation model that is testable, falsifiable, and predictive. I enjoy constructively integrating all 66 books of the Bible with all the science disciplines as a way to discover and apply deeper truths. 1 Peter 3:15–16 sets my ministry goal, "Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience." Hugh Ross launched his career at age seven when he went to the library to find out why stars are hot. Physics and astronomy captured his curiosity and never let go. At age seventeen he became the youngest person ever to serve as director of observations for Vancouver's Royal Astronomical Society. With the help of a provincial scholarship and a National Research Council (NRC) of Canada fellowship, he completed his undergraduate degree in physics (University of British Columbia) and graduate degrees in astronomy (University of Toronto). The NRC also sent him to the United States for postdoctoral studies. At Caltech he researched quasi-stellar objects, or "quasars," some of the most distant and ancient objects in the universe. Not all of Hugh's discoveries involved astrophysics. Prompted by curiosity, he studied the world’s religions and "holy books" and found only one book that proved scientifically and historically accurate: the Bible. Hugh started at religious "ground zero" and through scientific and historical reality-testing became convinced that the Bible is truly the Word of God! When he went on to describe for others his journey to faith in Jesus Christ, he was surprised to discover how many people believed or disbelieved without checking the evidence. Hugh's unshakable confidence that God's revelations in Scripture and nature do not, will not, and cannot contradict became his unique message. Wholeheartedly encouraged by family and friends, communicating that message as broadly and clearly as possible became his mission. Thus, in 1986, he founded science-faith think tank Reasons to Believe (RTB). He and his colleagues at RTB keep tabs on the frontiers of research to share with scientists and nonscientists alike the thrilling news of what's being discovered and how it connects with biblical theology. In this realm, he has written many books, including: The Fingerprint of God, The Creator and the Cosmos, Beyond the Cosmos, A Matter of Days, Creation as Science, Why the Universe Is the Way It Is, and More Than a Theory. Between writing books and articles, recording podcasts, and taking interviews, Hugh travels the world challenging students and faculty, churches and professional groups, to consider what they believe and why. He presents a persuasive case for Christianity without applying pressure. Because he treats people's questions and comments with respect, he is in great demand as a speaker and as a talk-radio and television guest. Having grown up amid the splendor of Canada's mountains, wildlife, and waterways, Hugh loves the outdoors. Hiking, trail running, and photography are among his favorite recreational pursuits - in addition to stargazing. Hugh lives in Southern California with his wife, Kathy, and two sons.



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