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By Maciej Onoszko WARSAW (Reuters) - Drilling at Poland's first shale gas exploration well using the controversial technique known as fracking has not harmed the environment, according to a government study published on Friday. Hydraulic cracking, or fracking, performed at a site in northern Poland operated by 3Legs Resources did not pollute groundwater or the atmosphere, said the study by the Polish Geological Institute. Fracking involves injecting water mixed with sand and chemicals into shale formations at high pressures to extract gas, a technique some fear pollutes underground aquifers and harms the environment

By Ruona Agbroko JOHANNESBURG (Reuters) - South Africa's cabinet placed a moratorium on Thursday on oil and gas exploration licenses in the semi-arid Karoo region, where the controversial shale extraction technique of "fracking" might be deployed. [More]