They discovered an ice "time capsule". It contained a history from 128 thousand years ago.

Researchers studied ice cores from the Guliya ice cap in Tibet, revealing consistent oxygen isotope patterns over 23 years. This indicates reliable climate history preservation. The ice cores, dating back over 128,000 years, provide insights into past environmental conditions. The findings challenge previous assumptions that the oldest ice dated only to the Holocene epoch. Understanding the age of these ice layers is crucial for reconstructing Earth's glacial history and natural climate cycles. The team plans further analysis to refine interpretations of ancient climate data.