Scientists in Antarctica have identified Earth’s oldest directly dated air sample, offering major insights into ancient climate change, atmospheric evolution and long-term global cooling patterns.

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• Researchers discovered a 6-million-year-old air sample trapped inside ancient Antarctic ice, making it the oldest directly dated atmospheric sample ever identified on Earth.
• The discovery was made in the Allan Hills region of East Antarctica, an area globally known for preserving extremely old blue ice formations.
• Tiny air bubbles trapped inside the ice preserved ancient atmospheric gases, allowing scientists to study Earth’s historical climate and environmental conditions directly.
• Scientists used argon isotope analysis to determine the age of the trapped air, helping establish long-term Antarctic cooling patterns over millions of years.
• The study estimated nearly 12 degrees Celsius of long-term cooling in Antarctica during the last 6 million years of Earth’s climate history.
• The research was conducted by experts associated with the Center for Oldest Ice Exploration, also known as COLDEX, funded by the National Science Foundation.
• Scientists from Woods Hole Oceanographic Institution and Princeton University led the study, which was published in the Proceedings of the National Academy of Sciences.
• The discovery is expected to improve understanding of ancient greenhouse gas levels, ice age cycles and long-term climate transitions affecting Earth’s atmosphere.