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Former Soviet Union crude oil, natural gas, and coal production compared to the radiocarbon isotope data from Vork 9. (A) FSU crude oil production in millions of barrels per day,62 (B) FSU natural gas production in billion m3 year–1,62 (C) coal production in Vorkuta (green) and Inta (violet) in megatonnes,63,64 and (D) Vork 9 data on the percentage of biomass combustion-derived SBC, as in Figure 3b.
