Shares of natural gas transportation fuels leader Clean Energy Fuels (NASDAQ: CLNE) have lost 42% of their value since September 2016. In fact, the stock is threatening its 52-week — and all-time — low of just $2.15 per share. Then again, you’re always told to buy low. Investors wondering if now is a good time to buy should answer another question first: How risky is Clean Energy Fuels?
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