Water Security
Water security becomes an explicitly geopolitical issue whenever the water supply itself crosses international borders: roughly 40 percent of the world's population lives in a river or lake basin shared by two or more countries, so a country's ability to reliably meet its own water needs today and in the future can depend on decisions made upstream by a neighboring government. When an upstream country builds a dam or diverts water from a shared river, it can directly reduce the water available to downstream countries, which is why managing water security often depends on treaties and diplomatic cooperation between nations rather than something any single country fully controls on its own.
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