Is that the sea level rising, or is the sand just being swept away? Speaking of sea levels, you keep hearing that they rise higher every year — but how exactly is that measured? After all ...

Several regions of the US could ... 2050 if sea levels continue to rise at rates of 2mm and 4mm due to climate change.

The space agency explained on its website that the acceleration of sea level rise "was due to an unusual amount of ocean warming, combined with meltwater from land-based ice such as glaciers." ...