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Fracking, explained - Vox
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Opinion | The Facts on Fracking - The New York Times
What Is Fracking? - YouTube
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What ever happened with Europe′s fracking boom? | Environment | All topics from climate change to conservation | DW | 20.07.2015
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Fracking fracas: Pros and cons of controversial gas extraction process | The Star
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Fracking Definition
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What is fracking and why is it controversial? - BBC News
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Fracking Definition
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The Environmental Costs and Benefits of Fracking | REVE News of the wind sector in Spain and in the world
fracking | Definition, Environmental Concerns, & Facts | Britannica
