By 2050, sea level along contiguous U.S. coastlines could rise as much as 12 inches (30 centimeters) above today's waterline, according to researchers who analyzed nearly three decades of satellite observations.
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A 1-foot rise in sea level swallows up more coastline than you think. For every 1 foot of vertical rise in sea level, 100 feet of shoreline is swallowed up if the slope is just 1% or more. That's a typical slope for most coastlines.