Writing task 1 This line graph provides an overview on the amounts of energy consumption provided by different fuels in the USA during the period from 1980 to 2030. As can be seen from the graph, the energy consumption by petrol and oil was significantly larger than the other fuels in 1980 (35quadrillion units), which continued to grow up with ups and downs and is predicted to increase remarkably, reaching around 47 quadrillion units by 2030. A similar trend can be observed as for the energy consumption provided by coal and natural gas, which began at 20 and 15 quadrillion units in 1980, respectively, and was consumed with a similar increase before 2015, after which the coal consumption is predicted to grow up largely, while the natural gas remains at a consumption level about 25 quadrillion units. A quite low consumption was observed in terms of nuclear, solar/wind and hydropower in 1980, less than 5quadrillion units. However, a slight increase was witnessed on the consumption of nuclear and solar/wind, with the rising rate of nuclear surpassing that of solar/wind. By contrast, few changes can be observed during the whole period in terms of the hydropower consumption.