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 occurred.

This pie charts depict the proportion of five crucial energy in the USA in both 1990s and 1980s.It is clear from the graph that the oil over taken the highest percentage in both span. According to what is shown, oil in 1980 represented the fist hrighest ratio at 42% while in 1980 was ranked the […]