Mean sea level: average height of the sea surface over a 19-year period.
UNESCO: L O S S A R Y
Even a small increase in sea level can mean a lot more flooding in a storm, and more frequent floods than in the past.
FORBES: Rising Seas Along the East Coast
In the Mekong River Delta, for instance, the sea level rising by 2 meters (6.5 feet) could mean the loss of millions of acres of agricultural land, reducing it by half, Ehrhart said.
CNN: Climate change may displace up to 200 million
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