Lack of rain in particular in Southern Spain, where humidity is high and currently potable water reserve is used for agricultural use. Water tables are dropping and water supply is short.

Plantations such as olive, almonds, alovera which are common in southern Spain and require low amount of water can be, watered using low grade (none potable) water obtained from dehumidification. This can be done in efficient manner, without high costs, using basic systems.