SciDev.Net: The Intergovernmental Panel on Climate Change (IPCC) has just issued a "final warning" that the window of opportunity for keeping global warming below the critical threshold of two degrees Celsius is fast closing. It came in the shape of the 'synthesis report': a distilled summary of the panel's fifth assessment report, which has been under preparation since 2009. IPCC chair Rajendra Pachauri said negotiators attending the UN's 2015 climate conference this time next year, where global agreement...