In Henery Adams's audio biography 'The Education of Henry Adams'http://en.wikipedia.org/wiki/The_Education_of_Henry_Adams (i.e. Henery Adams the grandson of John Quincy Adams was a 19'th century historian). He discusses his theory of history. In his model history is driven by the law of Acceleration which discribes the exponential growth of energy consumption through the 19'th century http://www.bartleby.com/159/34.html. Exponential growth in energy consumption was viewed as unsustainable as early as the 1860's but Henry Adams noted that it continued throughout his life up until the time he wrote his biography in 1904 and he saw no end to it.