Canada has 20 % of the world's freshwater ( not 50 % + ), but most of that is " fossil water "-- left over from the Ice Age rather than renewed each year.
22.
The enormous depth and tropical location of the lake can prevent'turnover'of water masses, which means that much of the lower depths of the lake are so-called'fossil water'and are catchment area of the lake is.
23.
The fossil waters mined in these projects accumulated during periods of wetter climate in the Pleistocene glacial epochs, between 10, 000 and 2 million years ago, and are not being replenished under current climatic conditions.
24.
In other regions that do receive significant precipitation and where recharge does occur, fossil water may be extracted and eventually replaced by younger water, in which case the water in those aquifers could be considered a renewable resource.
