The following video is part of our "Motley Fool Conversations" series, in which analyst John Reeves and advisor David Meier discuss topics across the investing world.

ExxonMobil CEO Rex Tillerson recently said that he sees a lot of demand for natural gas in the future, which will make it the second largest energy source by 2040. ExxonMobil also thinks the United States will be exporting gas soon, with Cheniere Energy leading the way. It might be easy for investors to dismiss ExxonMobil as just talking up its book. Looking back over history, however, it's hard to bet against them succeeding over the long term with natural gas.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.