Isostatic Rebound: a Glimmer of Hope or Wishful Thinking?

This is not solely North American anxiety, either. Data from the European Environment Agency (EEA) shows that the sea and its meeting points with land across continents are in an ongoing state of flux. Global mean sea levels have risen by approximately 23 centimetres since 1900, with 2024 marking the highest values on record. Being a low-lying nation with nearly 4,000 kilometres of coastline, it makes one wonder how Estonia will fare.

A recent comment on one of Eesti Elu’s YouTube videos suggested that an ancient geological counterweight could minimize this change. A phenomenon known as isostatic rebound, or glacial isostatic adjustment, indicates that the Earth’s crust has essentially been exhaling after a long, heavy burden. During the last ice age, a massive sheet of ice over a kilometre thick pressed the Estonian landmass deep into the mantle below. When the ice fully retreated roughly 11,000 years ago, the land began to adjust. According to NASA’s Earth Observatory, this viscoelastic adjustment is still happening today. With the pressure of the ice removed, the ground began to rise at a rate that, in some parts of the world, can exceed 10 millimetres per year.