Independent (UK): The United Nations has appointed a Costa Rican diplomat as its new climate change chief after small island nations intervened to press for a choice who would represent their concerns about the risks of global warming. Christiana Figueres, a climate change expert, has been a negotiator for her country at international emissions reduction meetings since 1995, and regularly chairs UN meetings. Ms Figueres only emerged as secretary general Ban Ki-moon’s choice after a late …