More than 20 polar research teams have
combined forces to produce estimates of the state of the ice in Greenland and
Antarctica in a paper in Science.
Until now different measurement means have
produced a wide range of estimates with large uncertainties.
But sea-level rise is now among the most
pressing questions of our time.
Polar ice has a tremendous capacity to cause
massive rises - with huge potential impacts on coastal cities and communities
around the world.
But the remoteness and sheer size of the ice
sheets mean accurate measurements are a serious challenge even for satellites
which have to distinguish snow from ice, and the rise of the land from the
shrinking of the ice.
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