During most of the past 100,000 years, temperatures on Earth were much colder than they are now and climate was very unstable. About 21,000 years ago that climatic period culminated in the Last Glacial Maximum (LGM), when about 50 million km~3 of water was locked in huge ice sheets, lowering sea level by more than 120 metres. Climate during the LGM was clearly very different from what it is today. But how different? This is the subject of the paper by Ganopolski et al. on page351 ofthisissue.
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