About Sea Level Change and the Oceans Water Levels

Global warming can lead to sea level rises across the planet, it is calculated by experts that over the last century sea levels have risen by a mean rate of 1.8mm each year. In recent years it is estimated that they have risen sharply from between 2.8 ± 0.4 to 3.1 ± 0.7mm per year.

The levels are set to rise further over the coming decades and indeed centuries due to human activities causing and contributing to global warming. The rising temperatures can cause thermal expansion of water and extensive melting of the polar ice caps. Thermal expansion is a larger contributor to sea level rises than the melting of ice caps, and this is expected to continue over the coming years. The melting ice caps are thought to be a lesser contributor they are also much harder to quantify, calculate and predict.
Experts have predicted sea level rises from 90 to 880 mm over the next 100 years but it is impossible to predict exactly, but a average value of 480mm is thought of as a general amount.

Other experts predict higher rises from up to 1.3 meters in the next 100 years, other models of glacial flow show a rise of up to just 80 centimetres.