[kingu]

Volcanic heat "cannot explain the more widespread thinning of West Antarctic glaciers that together are contributing nearly 0.2mm (0.008 of an inch) per year to sea-level rise," he adds.

How would one be able to measure the change in the level of the sea to such an exacting standard as 0.2mm? You would need an absolutely stable rockmass to measure from which is well away from any plate tectonics, which describes absolutely no place on the planet.

[squidly]

How would one be able to measure the change in the level of the sea to such an exacting standard as 0.2mm?

I guess the sea was really calm the times they measured it.

[Strategerist]

The 2004 Sumatran tsunami was measured across the entire world.

Believe it or not you can achieve extreme accuracy in sea level measurement.