I think one of the main reasons is the transportation costs. To transport water over thousands and thousands of miles to where it is needed is very financial and resource intensive. Building pipes take time and lots of planning and a lot of work. The water from melted glaciers will most likely mixed with salty seawater before we can get to it, so it will be difficult to harvest fresh drinking water from the glaciers.
Yes, difficult it will be, but if it can help overcome all the hue and cry about people dying from lack of water…. or saving water, else it would become really scanty in future…I think it should be worth investing a considerable amount of capital and infrastructure on it!! ..??
Glacial water is drinkable and in many cases a pure source of water. However, for a few reasons, glacier water must still be filtered. For starters, flake of glacial snow must form around a nucleus, or a particle from somewhere. In many cases, these particles are salt or volcanic ash, meaning glacier water is full of foreign particles that must be filtered.
Also, each flake of glacial snow helps clean the atmosphere from pollutants. Acid rain has been occurring for thousands of years (only industrial acid rain is new). Glaciers, then, are full of atmospheric contaminants. Finally, glacier water is contaminated by mammals like humans, etc. There are trace amounts of urine and similar contaminants in glacier water.
That said, glaciers contain 75% of the world’s fresh water. At some point, glaciers will become a substantial part of our water supply.
then sure enough, glacier water can be a hope for the future…….. !!
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