"...our analysis suggests that the corresponding resource-limited production peak will occur soon, between perhaps 2022 to 2025. If then we add tar sands and Orinoco oil, the expected resource-limited total peak occurs around 2030, although there is a major question over whether significantly increased production rates of the latter two classes of oil is possible. Finally, the resource-limited production peak of global ‘all-liquids’ is expected about 2040 or a bit after if the latter liquids are also produced at the maximal rate"
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