Radio New Zealand: The United Nations’ chief negotiator on climate change says wealthy nations will have to find at least $US10 billion to help developing countries deal with climate change. Yvo de Boer says that commitment would be one measure of success for a climate change conference to be held in Copenhagen in December. Mr de Boer says $US10 billion is just the bare minimum to help developing nations. Two other critical issues have to be resolved at the conference, the BBC …