umption in goods. The I per head * 10% China Africa 5 20 Economic, environmental and social Questions 1 The pie chart in Figure 15.11 shows the percentages of the main energy sources used by a certain country. a What percentage is supplied by water power? b Which of the sources is/are renewable? < What is meant by 'renewable'? d Name two other renewable sources. e Why, if energy is always conserved, is it important to develop renewable sources? Figure 15.11 natural gas oil 25% 40% water 2% coal nuclear 8% 25%​