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There is no "Global" water shortage Water is a geopolitical issue, the biggest is clean water in 3rd world and any available water in more arid regions. The nations with the biggest water issues Middle East: Scarcity issues China: Water Quality India: Both, availability is also a problem... small/moderate scale programs to address water issues, ...


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If you're only asking "would there be enough water replaced for both the Baltic Sea region and Central Asia", the answer is simple mathematics. HELCOM states the size of the Baltic Sea catchment area to be some 1.74 million sq km (p. 10) and the mean precipitation since the mid-80s to be about 750 mm/a (p. 15). 1 740 000 km² × 750 mm = 1.740 × 1012 ...


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That's largely because iron is scarce in seawater. It is what is known as a limiting factor -- certain physiological processes can't occur in the absence of iron, so even if nutrients such as nitrogen and phosphorous are plentiful many organisms cannot metabolize them. Here's one popular-science article on this theme: The Complicated Role of Iron in Ocean ...


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