Agence France-Presse: Climate change is killing valuable coral reef systems, a United Nations-backed report published on Wednesday warned. The report — entitled “The Economics of Ecosystems and Biodiversity” — unveiled in Berlin, concluded: “We face the imminent loss of coral reefs due to climate change, with all the serious ecological, social and economic consequences this will entail.” It said coral reef systems were worth up to 172 billion dollars per year in terms of economic …