The fourth section, "Climate and Carbon", lays out in six chapters the history of climate science from the "discovery" of the atmosphere in the late 18th century and of the "ice age" in the early 19th century to its current central role in energy policy and debate. "New Energies", the fifth section, focuses on the "rebirth of renewables" and the role of energy efficiency. The final section, "The Road to the Future" describes the evolution of personal mobility and the growing global demand for automobiles.