COP26 will help determine the fate of coastal megacities, especially in Asia

Nations’ follow through — or lack thereof — on pledges made at the looming UN climate summit will help determine the long-term fate of tens of millions of people living in coastal megacities threatened by rising seas.

Why it matters: The delayed response of the climate system, with seas that warm and expand slowly and ice sheets that can take centuries to reach equilibrium — long after air temperatures have leveled off, means the stakes of COP26, and government decisions in coming years, are extraordinarily high.

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