In today's edition of Market Foolery, Motley Fool analysts answer a question from a listener with regard to the best way to invest in natural gas as a viable fuel source for the future. Investors could make a big conglomerate bet, like Royal Dutch Shell (NYSE: RDS.A), or a more focused play, like Westport (Nasdaq: WPRT). Generally speaking, Foolish analysts Mike Olson does not recommend an integrated major to play natural gas, and prefers an exploration and production company, or even a services company, instead.

That's not to say that Clean Energy Fuels couldn't have a bright future. The company is poised to make a big impact on an essential industry. Read all about Clean Energy Fuels in our brand new report. Just click here to get started.