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Approximately 14,000 years ago, warmer conditions began to melt the Pleistocene ice sheets. This warming was suddenly interrupted around 12,700 years ago by 1,000 years of below- average temperatures in northeastern North America and northern Europe. The onset of this sudden and prolonged cold snap, known as the Younger Dryas event, was caused primarily by which of the following?
Climatologists have used computer models to investigate possible consequences of increased average global temperatures on various Earth systems. According to the models, which of the following changes in an Earth system is likely to occur in association with an increase in average global temperatures?