Last summer a Halliburton executive did the unthinkable: He took a big ol’ swig of hydraulic fracturing fluid. No, he didn’t have a death wish. And yes, he appears to be doing just fine. He did it to prove a point: fracking fluid need not be toxic. What the exec drank was a new formulation of fracking fluid made with ingredients sourced from the food industry rather than the chemical industry. As public concern over the controversial practice of fracking mounts, Halliburton and a host of other companies are racing to fill a major void: finding a way of cracking rock to unlock oil and natural gas that is also environmentally benign. This article is a linkout only.