This book gives a comprehensive overview of our present understanding of
the Earth's cryosphere, its changes and their consequences for mean sea
level changes. Since the middle of the 19th century there has been an
increase of sea level height by 20-25 cm. Some 8-10 cm of this is due to
net losses from glaciers, the remainder being due to mass losses from
land ice and thermal expansion of the oceans. The mean sea level rise is
slowly accelerating; at present it is some 3 mm/year. Recent space
observations made by the GRACE satellite combined with ocean temperature
and volume measurements have enabled the separate contributions to sea
level rise from melting ice and from thermal expansion to be better
estimated. The estimation of mean sea level change is complicated by
changes in land level due to tectonic effects and to ongoing changes
following the latest major glaciation. The book gives an up-to-date
survey of our present knowledge of this crucial subject.