May be this is Earth’s way of telling President George W. Bush that global warming cannot be ignored: in just one year, the perennial sea ice cover in the Arctic Ocean has shrunk by nearly three-quarters of a million square kilometres, an area comparable to that of Bush’s home state of Texas.
Perennial sea ice is the ice that survives at least one summer, and is usually more than 3 metres thick. Son Nghiem of the Jet Propulsion Laboratory in Pasadena, California, and his colleagues used NASA’s QSCAT satellite to measure the changes in Arctic perennial ice from 2004 to…
