For instance, the NDVI of natural vegetation in Central Asia exhibited an increasing trend at a rate of 0.004 per decade prior to 1998, after which the trends reversed and the NDVI decreased at a rate of 0.003 per decade 26 .
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For instance, the NDVI of natural vegetation in Central Asia exhibited an increasing trend at a rate of 0.004 per decade prior to 1998, after which the trends reversed and the NDVI decreased at a rate of 0.003 per decade 26 .