AFP: The French yacht Tara leaves Sunday on the second leg of a three-year voyage across the world’s oceans to chart the effects of climate change on micro-organisms which produce half our oxygen. The 36-metre (118-foot) schooner will depart from Cape Town a year after leaving Lorient in western France to head across the Atlantic and Pacific oceans for New Zealand next August as part of a 150,000-kilometre (93,750-mile) journey. “Sunday … will be the birthday of the Tara Oceans …