sentences:  In 2006, Hudema implored Canadians to "save hockey" by fighting climate change, which he called "the biggest threat to hockey since the NHL labor talks".In July 2007, Hudema returned to Edmonton to work as the Climate and Energy Campaigner for Greenpeace Canada at its newly opened Edmonton office, which was created to lobby for an end to the Alberta oil sands, which Hudema called "one of the dirtiest, oiliest projects in the world".In this capacity, he ambushed Premier Ed Stelmach several times during the 2008 provincial election.