西班牙媒体：研究发现，格陵兰冰盖曾于7000年前完全消融

Core Insights - A groundbreaking study reveals that the Greenland ice sheet experienced significant melting and even complete disappearance approximately 7,000 years ago during the Holocene thermal maximum, challenging long-held beliefs about its stability [1][2] - The research, based on sediment samples from the "Prudhoe Dome," indicates that parts of the ice sheet were extremely vulnerable and had completely melted during a period when temperatures were only 3 to 5 degrees Celsius higher than pre-industrial levels [1][2] Group 1 - The study utilized extreme environment drilling to obtain original sediment and bedrock samples buried under over 500 meters of ice, confirming that the ice sheet had vanished in the past [1] - The findings suggest that the current climate crisis, driven by human activities, is causing unprecedented rates of warming, which could lead to similar melting scenarios in the future [2] - Historical evidence shows that polar ice systems are highly sensitive to sustained, moderate warming, and once a critical threshold is crossed, the melting process may become prolonged and irreversible [2] Group 2 - The research serves a practical purpose by improving global risk assessments related to sea level rise, identifying vulnerable areas like the Prudhoe Dome that respond sensitively to warming [2] - The study emphasizes the importance of geological evidence in predicting local sea level changes, moving beyond reliance on climate models alone [2] - The historical context of Greenland's ice sheet serves as a warning for potential future scenarios, highlighting the non-permanence of large ice caps [2]