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Article summary:
1. 本文介绍了多篇研究，探讨了历史和未来干旱变化的模拟和预测。
2. 研究表明全球变暖将导致21世纪美国西南部和中部平原地区面临前所未有的干旱风险。
3. 文章提到了一些不确定性，包括气候模型的局限性以及对未来人类活动的不确定性。
Article analysis:
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