Among the principal energy resources used worldwide, which single fuel supplies about 40% of the world's energy, with much of it going to transportation?

1. Among the principal world energy resources, oil supplies about 40% of total world energy use. 2. Much of that oil-derived energy is used specifically for transportation. 3. Coal and natural gas are both major fuels too, but neither is credited with the 40% share attributed to oil here. 4. Nuclear power supplies a much smaller share of world energy than oil does. _Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.9 World Energy Use_