Which of the following statements related to fracking (hydraulic fracturing) is correct? A. The fracking process does not increase the efficiency and well productivity. B. The fracking process uses very little liquid, and only uses sand. C. The most commonly used liquid for fracking is water with a number of chemicals added that are toxic or cancerogenic. D. If the fracking liquid is returned to the surface, it is already purified by the soil and does not need further treatment. E. Fracking for natural gas is considered a sustainable energy technology due to its high efficiency.

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Environmental health and hazards

An organism's environment is the environment in which it lives and has an impact on its well-being. The World Health Organization (WHO) defines environmental health as "those aspects of public health, such as quality of life, that are influenced by physical, chemical, biological, social, and psychosocial components in the environment." Environmental health is concerned with both natural and man-made settings in order to enhance public health. Environmental science, occupational medicine, toxicology, and epidemiology are the key subdisciplines of environmental health.