A woman holds a banner that reads in Spanish; "Down with the Chevron- YPF agreement," during a protest in Buenos Aires, Argentina, Wednesday, May 21, 2014. Demonstrators gathered to protest against a joint venture between YPF and Chevron to use hydraulic fracturing or "fracking" at a major shale oil and gas deposit known as "Vaca Muerta." (AP Photo/Natacha Pisarenko)
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