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.

A recent article in The Wall Street Journal highlighted the growing trend of trucks switching from diesel to natural gas. For example, Waste Management announced that it expects 80% of the trucks it purchases to use natural gas because of the impressive cost savings. UPS and FedEx are also converting their fleets to natural gas. So it looks like the economics of natural gas are becoming very compelling. Westport Innovations is one company that is driving the trend as it develops fuel systems to burn natural gas. The conversion is unlikely to be fast, however, so Westport Innovations might be a good idea for investors with long-term time horizons.

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