This September 2014 Low Carbon Economy Index by multinational accounting firm Pricewaterhouse-Coopers measures how G-20 countries are performing relative to their agreement at the 2009 United Nations Framework Convention on Climate Change to do what they must to keep global temperatures within 2 degrees Celsius of pre-industrial levels. The result: almost everyone is falling short. Their performance is critical; together they account for 85 percent of global carbon emissions.