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Earliest man-made climate change took place 11,500 years ago

The vast majority of climate scientists agree that climate-warming trends over the past century have been due to human activities. A new Tel Aviv University study has uncovered the earliest known geological indications of man-made climate change from 11,500 years ago.

Within a core sample retrieved from the Dead Sea, researchers discovered basin-wide erosion rates dramatically incompatible with known tectonic and climatic regimes of the period recorded.

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“Human impact on the natural environment is now endangering the entire planet,” said Prof. Shmuel Marco, Head of TAU’s Department of Geosciences, who led the research team. “It is therefore crucial to understand these fundamental processes. Our discovery provides a quantitative assessment for the commencement of significant human impact on the Earth’s geology and ecosystems.” The results of the study were published in Global and Planetary Change.

The research was conducted by TAU post-doctoral student Dr. Yin Lu and in collaboration with Prof. Dani Nadel and Prof. Nicolas Waldman, both of the University of Haifa. It took place as part of the Dead Sea Deep Drilling project, which harnessed a 1,500-foot-deep drill core to delve into the Dead Sea basin. The core sample provided the team with a sediment record of the last 220,000 years.

The newly-discovered erosion occurred during the Neolithic Revolution, the wide-scale transition of human cultures from hunting and gathering to agriculture and settlement. The shift resulted in an exponentially larger human population on the planet.

“Natural vegetation was replaced by crops, animals were domesticated, grazing reduced the natural plant cover, and deforestation provided more area for grazing,” said Prof. Marco. “All these resulted in the intensified erosion of the surface and increased sedimentation, which we discovered in the Dead Sea core sample.”

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A natural laboratory in the Dead Sea

The Dead Sea drainage basin serves as a natural laboratory for understanding how sedimentation rates in a deep basin are related to climate change, tectonics, and man-made impacts on the landscape.

“We noted a sharp threefold increase in the fine sand that was carried into the Dead Sea by seasonal floods,” said Prof. Marco. “This intensified erosion is incompatible with tectonic and climatic regimes during the Holocene, the geological epoch that began after the Pleistocene some 11,700 years ago.”

The researchers are currently in the process of recovering the record of earthquakes from the same drill core. “We have identified disturbances in the sediment layers that were triggered by the shaking of the lake bottom,” Prof. Marco said. “It will provide us with a 220,000-year record — the most extensive earthquake record in the world.”

Tel Aviv University

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Mark Milligan
Mark Milligan
Mark Milligan is multi-award-winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 7,500 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW), the World Federation of Science Journalists, and in 2023 was the recipient of the British Citizen Award for Education, the BCA Medal of Honour, and the UK Prime Minister's Points of Light Award.
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