Hryvnia collapse will put Ukraine's stability at risk

Currency crisis adds to Kyiv's woes with need for IMF and international financial aid intensifying

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Long-term viability of Mexico's Pemex is uncertain

Falling oil prices and its tax and pension burden are hitting hopes for Pemex, and the newly opened oil sector

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Low energy prices and differences over Russia could block plans for a European energy union

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Pressures on Venezuela's economy and oil output may encourage Cuban rapprochement with Washington

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Methane could have an immediate effect on reaching climate targets, given its shorter lifespan in atmosphere

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Lower oil prices and indigenous activism may bring about a rethink in hydrocarbons investment programmes

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Politics could upend energy reforms even as failures of the 2013 national energy policy erode growth

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Low oil prices are putting conflicting pressures on Chinese oil companies and policymakers

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The UAE is seeking to establish itself as a world-class hub for renewables as part of its economic diversification drive

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Efforts to combat climate change will include private sector initiatives, which will grow along with investment returns

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