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The image depicts renewable energy consumption from 1949-2008. Total renewable energy usage rose from approximately 2 quadrillion Btu in 1950 to about 7 quadrillion Btu by 2008, peaking near 6 quadrillion Btu around 1980 and again in the early 2000s. Wood consumption started just below 2 quadrillion Btu in 1950, declined below 1 by 1970, then fluctuated slightly around 1 until 2008. Hydroelectric power, similarly around 1.5 quadrillion Btu in 1950, increased to about 3 in the 1970s, remained fairly stable but dropped slightly to around 2.5 by 2008. Wind energy started around 0 after 1990, growing marginally by 2008. Biofuels began increasing notably after 1995 to slightly above 1 quadrillion Btu by 2008.
Given the complexity of the image, the above description may not be entirely accurate.
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The provided diagram depicts the summary proportion and the main resources of Geothermal power over the period from 1949 to 2008.
At the first glance, it is clear that the ratios of water electricity and tree were significantly higher than biofuels and wind. Moreover, it is obvious that, over the whole time, the trends of wind and biofuels increased, while, the trends of hydroelectric power and wood were almost unchanged.
Turning to the details, between 1950 and 1970, the proportions of total consumption and hydroelectric power were uplifting steadily from almost 2 and 3 quadrillion to 3 and 5 quadrillion, while, others remained roughly the same.
Between 1970 and 2008, the trends of total consumptions and hydroelectric power fluctuated, from approximately 4 and 2 quadrillion, to around 7 and 3 quadrillion, correspondingly. In the same period, the proportions of wood rose from almost 1,8 to 2 quadrillion, when the number of biofuels and wind climbed merely from 0 to around 1,6.
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