The provided line chart depicts the result of a study conducted on the amount of renewable energy used and its major sources from 1949 to 2008.

The provided line chart depicts the result of a study conducted on the amount of renewable energy used and its major sources from 1949 to 2008. A quick glance at this picture shows that all types of energy generally registered upward trends, but the ones that were utilized throughout the given period underwent wild fluctuations, while those that started to be used in later years were on the rise. Observing closely at the graph, it is clear that traditional forms of energy faced significant oscillations that occurred in the later period, which caused the total to palpitate as well. In particular, in 1949, both wood and hydroelectric power had almost the same starting point of around 1. 75 quadrillions BTU. Whilst the former had remain stabilized until 1976, the latter rose to slightly beneath 3 quadrillions BTU in the same year. From this point, both types of energy started to vacillate and stayed that way for 33 years, though the wood’s fluctuation rate is less than that of hydroelectric power. Similarly, the total energy consumption soared by roughly 2 quadrillion BTU in the first 27 years, followed by a considerable oscillation in the remaining years. Meanwhile, despite commencing 32 years late, biofuels and wind energy performed decently well. They had a rough start with barely any increase after 20 years, but after that, they started spiking to over 1 quadrillion BTU for biofuels and almost 0. 5 quadrillion BTU for wind.