Worldwide energy use has gone up almost thirteen times, from 12,100 terawatt hours per year in 1900 to 153,596 terawatt hours in 2017. The biggest drivers were cheap and abundant sources of energy: coal, crude oil, and natural gas. From 1900 to 2017, coal as a primary source of energy grew from 5,728 to 43,397 terawatt hours, crude oil grew from 181 to 53,752 petawatt hours (a petawatt hour is 1,000 terawatt hours), and natural gas grew from 64 to 36,704 terawatt hours.32
