Exxon Mobil (XOM) believes North America will be a net energy exporter by 2025, according to its "Outlook for Energy: A View to 2040," released on Tuesday Exxon sees total global energy demand rising 35% in 2040 vs. 2010 as developing nations become modernized. China and India, the two most populous countries, will drive up demand as more people escape poverty and can afford cars and electricity. The energy company anticipates natural gas will be