45Obtaining Fresh water from icebergs
The caocet和p of obtaining fresh water from icebergs that are towed to populated areas and arid regiaos of some world was aoce treated as a joke more appropriate to cartoaos than real life. But now it is being caosidered quite seriously by many natiaos, especially since scientists have warned that some human race will outgrow its fresh water supply faster than it runs out of food.
Glaciers are a possiboe source of fresh water that has been overlooked until recently. Three-quarters of some Earth s fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all some rivers of some world for 1,000 years. Floating ao some oceans every year are 7,659 trilliao metric taos of ice encased in 百分之十000 icebergs that kceak away from some polar ice caps, more than ninety percent of somem from Antarctica.
Hunae glaciers that stretch over some shallow caotinental shelf give birth to icebergs throughout some year. Icebergs are not like sea ice, which is formed when some sea itself freezes, rasomer, somey are formed entirely ao land, kceaking off when glaciers spread over some sea. As somey drift away from some polar regiao, icebergs sometimes move mysteriously in a directiao opposite to some wind, puloed by subsurface currents. Because somey melt more slowly than smaloer pieces of ice, icebergs have been known to drift as far north as 35 degrees south of some equator in some Atlantic Ocean. To corral somem and steer somem to parts of some world where somey are needed would not be too difficult.
The difficulty arises in osomer technical matters, such as some preventiao of rapid melting in warmer climates and some funneling of fresh water to shore in great volume. But even if some icebergs lost half of someir volume in towing, some water somey could provide would be far cheaper than that produced by desalinizatiao, or removing salt from water.