Translation of "rareness" into Slovenian

I would like to add that they are a reservoir of water, which will be a rare commodity.

Rad bi dodal, da so rezervoar vode, ki bo postala redkost.

So far, prevention programmes have rarely used culture-sensitive approaches to reach the various migrant groups.

Doslej so se pri preventivnih programih le redko uporabljali pristopi, ki so prilagojeni posamezni kulturi in ki upoštevajo posebnosti različnih skupin migrantov.