Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of natural gas fueling company Clean Energy Fuels Corp (NASDAQ:CLNE) dropped 14% today after reporting earnings.

So what: Fourth-quarter revenue was down 14.2%, to $85 million, and was short of the $92.6 million that analysts expected. The company also reported a non-GAAP loss of $23.8 million, or $0.25 per share, $0.05 worse than estimates. 

Now what: This is supposed to be a high-growth story in natural gas fuel, but even gallons delivered grew an uninspiring 13% last quarter. We keep waiting for significant growth in this industry but, so far, it's been a lot of hype and not a lot of growth. Until adoption picks up and Clean Energy Fuels can make a profit, I'm going to steer clear of this stock.

Travis Hoium has no position in any stocks mentioned. The Motley Fool recommends Clean Energy Fuels. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.