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Photo: Big Bend National Park under a brooding sky

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The gray colors of the sky contrast with the rich orange of Casa Grande, an iconic flat-topped summit in Texas' Big Bend National Park. The site is popular for hiking and rock climbing.

Would you like to see your nature photo featured as the TreeHugger photo of the day? Join TreeHugger’s Reader Photo Pool on Flickr and add your pictures to the group!

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