In 1800, the main fuel used in the United States was wood. (Assume wood is cellulose whose representative repeating formula is C6H12O6.) In 1900, the main fuel used was coal (assume coal in this example can be approximated by pure carbon, C). In 2014, the main fuel used is oil (assume it can be repre- sented by isooctane). Assume that, in 2100, the main fuel will be hydrogen (H2). Use a spreadsheet to prepare a graph of carbon dioxide released per kJ of energy produced (y-axis) as a function of year (x-axis) from 1850 to 2050.