he picture illustrates the proportion of four different renewable resources (hydroelectric power, wood, biofuels, and wind) consumed by Americans from 1949 to 2008. Units are measured in quadrillion BTU.

The picture illustrates the proportion of four different renewable resources (hydroelectric power, wood, biofuels, and wind) consumed by Americans from 1949 to 2008. Units are measured in quadrillion BTU. As is observed from the graph, the total amount of energy consumption was around 3 in 1950, while this number in 2008 was almost three times higher with 6. 5 quadrillions. According to the given data, wood and hydroelectric power were the two sources consumed in 1950 and both were under 2 quadrillion. We can see that their growth through the researched timescales had fluctuations. In the year 2008, the consumption of wood and hydroelectric resource was marginally under and over 2 quadrillions respectively. The remaining resources, which were biofuels and wind, were first introduced in the USA in 1981. However, they witnessed a significant escalation during the 27-year period. In the final year, the used amount of biofuels was two times higher than that of wind, at 1 and 0. 5 quadrillion respectively.