#Six-million-year-old Antarctic ice containing ancient air bubbles offers the oldest direct evidence of past climate, providing new insights into Earth's warmer periods and long-term cooling trends. @oregonstateuniv @PNASNews https://t.co/Xel881EcIZ https://t.co/Jnb7Mjx2KK

— Phys.org (@physorg_com) October 29, 2025