EnvironmentNations come together for Arctic clean-up exerciseFirst responders from four countries meet in Greenland for spill, search-and-rescue drillsTraining: Crew members from the USCGC Oak pictured during a medical drill conducted with Danish navy ship Ejnar Mikkelsen in the Hamborgersund fjords off GreenlandPhoto: DIANA SHERBS/USCGRussell McCulleyLondon