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Icings (also known as aufeis or naleds) are comprised of groundwater that freezes when it reaches the streambed during winter.
Here's how Wired naleds - that occur naturally in far northern climates and can grow to be more than seven meters thick.
The Guardian adds: naleds also known as Aufeis, German for "ice on top"have been known for hundreds of years.
Climate change is likely to melt permafrost from most of Central Asia, but some studies - including this one by geologist Robin Grayson - suggest that most naleds will survive and that they could be used to strengthen permafrost, protect biodiversity from climate change and create "cool parks" to combat urban heat islands of cities in summer heat-waves.
Mongolia's capital city, Ulan Bator, is planning to keep itself cool during the hot summer months by shunning air conditioning in favor of creating an the Guardian - the city of Ulan Bator will attempt to capture some of the cool winter temperatures in huge ice blocks that will slowly melt over the summer and naleds - that occur naturally in far northern climates and can grow to be more than seven meters thick.