AAP: Tens of thousands of protesters are expected to march through central Sydney on Sunday to urge leaders to take action on climate change. Rallies will also be held in other capitals including Adelaide, Perth, Hobart and Canberra as global leaders head to the United Nations climate summit in Paris. Sydney march organiser Reece Proudfoot says those taking part in the Australian marches will walk in solidarity with millions of people across the world as part of the global campaign.