New York Times: Major polluters must immediately begin to reduce greenhouse gas emissions if the rise in global temperatures is to be held in check without paying a higher price later, according to a report Tuesday from the United Nations Environment Program. While a failure to act swiftly will not necessarily doom the effort to limit the rise in global temperatures to 2 degrees Celsius, or 3.6 degrees Fahrenheit,, above preindustrial levels, it will make it much harder and more expensive to do so, the agency noted...