For his article in Technology Review, “Can Fracking Be Cleaned Up?” reporter Kevin Bullis asked Professor Franz-Josef Ulm how the quality of cement used in natural gas wells might affect aquifer contamination due to fracking. “Whenever there was a gas leakage, it came out because the cement was not well done … When it comes to cementing, the solutions are out there. The question is whether they are being applied,” Ulm says.