Hydrometeorological developments Since 1980, Iran has been facing an overall trend towards drier meteorological conditions, whereas an increase in temperature proved to be the main driver rather than a decrease in precipitation (Fig. 1 ).
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Interrelations of vegetation growth and water scarcity in Iran revealed by satellite time series.
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The last decades showed a clear trend in rising temperature, whereas often no significant trends in annual precipitation could be observed 29 , 30 .