Photo - In this March 29, 2013 photo, a worker checks a dipstick to check water levels and temperatures in a series of tanks at an Encana Oil & Gas (USA) Inc. hydraulic fracturing operation at a gas drilling site outside Rifle, Colorado. In the 2000s, large investors in so-called clean technology wanted to finance companies that would help eliminate the world's dependence on oil, natural gas and coal. But in 2013, clean technology investment funds are not trying to replace the fossil fuel industry, they're trying to help it by financing companies that can make mining and drilling less dirty. (AP Photo/Brennan Linsley)
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