For centuries, the Yangtze River has been China’s vital lifeblood, yet its floods have claimed countless lives. To tame its waters, flood-control systems have evolved from ancient dykes to the engineering marvel of the Three Gorges Dam. But a new study has uncovered a paradox: some human interventions may have inadvertently worsened the very flood risks they were built to mitigate. “We show that flood frequency peaked during the Little Ice Age 1500−1850 … and that human interventions,...
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