Chesapeake Energy Chairman and CEO Aubrey McClendon fired back against critics of hydraulic fracturing during an energy conference in Philadelphia. "Looking back, was anybody hurt? Was there any permanent or even temporary environmental damage? No, no and no," McClendon said, adding that the risks of fracking were outweighed by the benefits such as new jobs and lower energy costs. The issue of methane contamination in fracking wells was also thoroughly addressed using stricter well-casing standards, he said.