Moreover, analyses of historical precipitation, streamflow, and soil moisture indices show an increasing trend of aridity over many regions around the globe ( 4 ), and model simulations point to an increasing drought hazard in the 21st century.
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A century of observations reveals increasing likelihood of continental-scale compound dry-hot extremes.
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The sentences
The cumulative area observing >25-year dry years, however, is not associated with an increasing or a decreasing trend.