"For years, environmentalists and the gas drilling industry have been in a pitched battle over the possible health implications of hydro fracking. But to a great extent, the debate — as well as the emerging lawsuits and the various proposed regulations in numerous states — has been hampered by a shortage of science."

"In 2011, when ProPublica first reported on the different health problems afflicting people living near gas drilling operations, only a handful of health studies had been published.  Three years later, the science is far from settled, but there is a growing body of research to consider.

Below, ProPublica offers a survey of some of that work. The studies included are by no means a comprehensive review of the scientific literature. There are several others that characterize the chemicals in fracking fluids, air emissions and waste discharges. Some present results of community level surveys.

Yet, a long-term systematic study of the adverse effects of gas drilling on communities has yet to be undertaken. Researchers have pointed to the scarcity of funding available for large-scale studies as a major obstacle in tackling the issue."

Naveena Sadasivam reports for ProPublica March 5, 2014. [2]