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Sustainability (page 121)

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Back-crowned night heron (FCS/Shutterstock)

(Leonard Zhukovsky/Shutterstock)

America's biking Renaissance

Al Roker interviews Barack Obama on the Today Show, May 7, 2014. (NBC)

Al Roker, save us from idiots!

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This undated photograph shows one of the 14 new species of so-called dancing frogs discovered by a team headed by University of Delhi professor Sathyabhama Das Biju in the jungle mountains of southern India. The study listing the new species brings the number of known Indian dancing frogs to 24 and attempts the first near-complete taxonomic sampling of the single-genus family found exclusively in southern India's lush mountain range called the Western Ghats, which stretches 1,600 kilometers (990 miles) from the west state of Maharashtra down to the country's southern tip. (AP Photo/Satyabhama Das Biju) (AP)

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Bring on the renewables

This Dec. 30, 2013 file photo shows a fireball going up at the site of an oil train derailment in Casselton, N.D. (AP Photo/Bruce Crummy, File)

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Screenshot from the "Koch Brothers Exposed" trailer (Screenshot from the "Koch Brothers Exposed" trailer)

(Screenshot, CNN)

(AP/Luann Hunt)

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Sergey Brin (Reuters/Jim Urquhart/Salon)

Google's Uber power play

(Screenshot, Fox News)

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(Screenshot, Andy Jacobson, CIRES/NOAA)

The aftermath of Superstorm Sandy at Rockaway Beach (Anton Oparin/Shutterstock)

Climate change hits the U.S.

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(AP/Alex Brandon)

Neil deGrasse Tyson (AP/Frank Micelotta)

(Andrzej Gibasiewicz/Shutterstock)

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