Any saltwater that can't be evaporated is put to use elsewhere, says Pawlyn.

CNN: Project to turn desert green trials in Qatar

The liquid should be almost entirely evaporated before blending.

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With the cold war's end, Russia's strategic need to be close to the Arab states evaporated too.

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Some of the evaporated seawater inside the greenhouse also condenses creating freshwater, which will be used to irrigate plants.

CNN: Project to turn desert green trials in Qatar

It is proposed that the cell might be used in applications which require relatively low power consumption, for example sensors of various kinds or emergency signaling units, and that the devices might be used best in desert or warm coastal regions where the water is readily evaporated from the cell, thus maintaining its concentration gradient.

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But that has since evaporated, just as it did in Denmark three years ago, and now the no camp seems to be in the ascendant.

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