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Sustainability (page 109)

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Lindsay Abrams
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Firefighter Kathleen Calvin looks around as she sits atop her fire truck while waiting to begin work as smoke from a wildfire fills the sky behind Saturday, July 19, 2014, in Winthrop, Wash. (AP Photo/Elaine Thompson)

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The future of driving is tolls

Henry Grabar
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Why our brains love the ocean

Wallace J. Nichols

"Organic" food's dirty secret

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Cliff Weathers - Alternet
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Sockeye salmon spawn in an Alaskan river (Pete Niesen/Shutterstock)

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North Atlantic Right Whale (Stephen Meese/Shutterstock)

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Annemarie Dooling
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Smallpox virus (CDC)

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David Gessner
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