The big thaw: Greenland ice cover is melting away

The vast ice sheet of Greenland, which holds enough water to raise global sea levels by 7.2 metres, underwent a remarkable transformation for a few days this month when scientists observed an unprecedented melting of its frozen surface.

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Greenland, National Theatre: Lyttelton, London

Enter pursued by a (polar) bear. There's a wonderful moment in Greenland where this white ursine creature lopes in, to the consternation not just of the geographers on the Arctic island where, because of global warming, the Inuits are having to invent a noun for "robin", but of the policy wonks with their laptops who are preparing for a global summit on this issue. The piece goes in for that kind of conceptual compositeness. The creature noses around and then exits pursued by no one.