Colborn, Theo et al. “Natural Gas Operations from a Public Health Perspective.” International Journal of Human and Ecological Risk Assessment. September 2011.

Study found that 25 percent of chemicals known to have been used in fracking fluids are implicated in cancer; 37 percent could disrupt the endocrine system; 40 to 50 percent could cause nervous, immune and cardiovascular system problems; and more than 75 percent could affect the skin, eyes and respiratory system, resulting in problems like skin and eye irritation or flu-like symptoms.

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