World energy consumption by fuel type, 1990-2035 (quadrillion BTU). In the long-term, the Reference case projects increased world consumption of marketed energy from all fuel sources through 2035. Fossil fuels are expected to continue supplying much of the energy used worldwide. eia.gov

In the long-term, the Reference case projects increased world consumption of marketed energy from all fuel sources through 2035. Fossil fuels are expected to continue supplying much of the energy used worldwide. Although liquid fuels—mostly petroleum based—remain the largest source of energy, the liquids share of world marketed energy consumption falls from 34 percent in 2008 to 29 percent in 2035, as projected high world oil prices lead many energy users to switch away from liquid fuels when feasible. Renewable energy is the world’s fastest growing form of energy, and the renewable share of total energy use increases from 10 percent in 2008 to 14 percent in 2035 in the Reference case.

International Energy Outlook 2011