Fidel Castro's well -presented full -page article, published in your editorial page , is a sound scientific analysis of what is happening and the dangerous aftermath of the methodology for exploration of methane from geological shale structures by the United States.Releasing the trapped methane gas from shale by forced hydraulic fracturing of the underground shale structure is a procedure in Castro's article. This procefure uses benzene and toluene to be injected mixed with water for the hydraulic fracture of the shale structure, releases water contaminated with carcinogenic benzene and toluene into water bodies.
According to Castro, his observations are based on research findings of many knowledgeable West European scientists involved in the study of this method of methane gas extraction. They point to this and other hazards that may even upset the underground geological structures causing calamities like earthquake or floods. His observations sum up that the 'hydraulic process' can damage our underground shale structure and in his considered opinion it is 'an adventure that is far too premature and risky.' Finally, I express my admiration for Mr Castro, a few years older than I am , for presenting a lucid and well-researched paper of great international importance, providing knowledge and information on an important but new subject.
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