At the same time, there is urgent need to expand access to modern sources of energy to meet the needs of a large proportion of people in some of the poorest countries, who depend on traditional energy sources to the detriment of their health from air pollution. In 2012 fossil fuels accounted for 81.7 percent of the global primary energy mix, while low-carbon nuclear power accounted for 4.8 percent, hydroelectricity for 2.4 percent, and biomass for 10 percent. Modern renewables jointly accounted for only 1.1 percent. ( International Energy Agency, 2014).