Greenland's Ice Sheet Was Supposed to Be Rapidly Melting Away. It Hasn't Been

# Summary A scientific review synthesizing 66 Arctic lake-based glacier records reveals that most Arctic glaciers and ice caps were smaller or absent during the middle Holocene (around 7,000-6,000 years ago) when summers were warmer than today, contrary to assumptions about their recent rapid decline. The records show glaciers began regrowing around 6,000 years ago as Arctic summers cooled, with two periods of enhanced glacier growth occurring between 4,500-3,000 years ago and after 2,000 years ago, placing modern glacier retreat into a longer historical context.