The given line graph delineates the amount of energy used in the United States from 1970, and provides projections up until 2030.
Overall, it can be seen there was an increase of energy consumption in the surveyed years. Petrol and oil have consistently been the dominant source, while nuclear power will account for the smallest proportion by 2030.
In 1970, petrol and oil was the highest among others, slightly over 10 billion units. Their consumption is projected to rise gradually, reaching its peak of 20 billion units in 2030. Despite being the leading source, it is set to remain unchallenged, and it always the smallest rise throughout the period. Nevertheless, the second most consumed energy, nuclear power, is in sharp contrast to this. The amount of this non-renewable energy started at around 6 billion units, after which it experience a gradually rise about 2-3 billion units, before ending the period at below 5 billion units.
Regarding the remaining energy sources, the proportion of natural fuel possessed less than petrol, oil and nuclear. Both initially starting with under 3 billion units, but until that time, they skyrocket to 12-15 billion units. In 2030, the amount of geothermal energy quadrupled those in 60 years ago, while the consumption of solar and wind power hit its lowest point at about 1 billion units, followed by a drastically growth to around 12 billion units at the end.
