Emilia-Romagna has been a highly populated area since ancient times. Inhabitants over the centuries have radically altered the landscape, building cities, reclaiming wetlands, and establishing large agricultural areas. All these transformations in past centuries changed the aspect of the region, converting large natural areas to cultivation, up until the 1960s. The trend then changed, and agricultural lands began giving way to residential and industrial areas. The increase of urban-industrial areas continued at very high rates until the end of the 2010s. In the same period, hilly and mountainous areas saw an increase in the registration of semi-natural areas, because of the abandonment of agricultural lands.
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