The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Write a report for a university lecturer describing the changes which occured

The two pie charts compare the percentages of five different energy sources: oil, natural gas, coal, hydroelectric power and nuclear power in the United States in the years 1980 and 1990. Overall, it is clear that oil was the most dominant energy source in both decades, although its share declined significantly. By contrast, nuclear power […]