http://corporate.exxonmobil.com/en/community/corporate-citizenship-report http://corporate.exxonmobil.com/en/current-issues/water http://corporate.exxonmobil.com/en/current-issues/water x 18 10 13 80or or= 10 13 80or or= 10 13 80or or= 10 13 80or or= 10 13 80or or=or or Environmental performance exxonmobil.com/citizenship 49 As illustrated on the right, the amount of the freshwater needed to produce an identical unit of energy from natural gas is less than for a variety of other energy sources, including hydroelectric power and ethanol.