Bulgaria cancels Chevron shale gas permit

Reuters: The Bulgarian government, preparing a full ban on shale gas drilling due to environmental concerns, on Tuesday cancelled a exploration permit for the unconventional energy source that it granted to U.S. energy major Chevron in June. The centre-right government decided Chevron can still prospect for oil and gas in northeastern Bulgaria but only by using conventional drilling techniques and not hydraulic fracturing, which involves injecting water mixed with sand and chemicals at high pressure into......

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