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Sustainability (page 171)

In this Feb. 7, 1975 file photo, Ruth Patrick, a pioneer in the study of water pollution, talks about her selection as this year's winner of the John and Alice Tyler Ecology Prize in Beverly Hills, Calif. Patrick, a scientist whose research on freshwater ecosystems led to groundbreaking ways to measure pollution in rivers and streams, has died Monday, Sept. 23, 2013, according to the Academy of Natural Sciences at Drexel University in Philadelphia. She was 105. (AP/George Brich)

(Screenshot, BBC News)

IVANPAH, CALIFORNIA, APRIL 05 2013: An aerial view of Tower 1 and its heliostats at the Ivanpah Solar Power Facility. (photo Gilles Mingasson/Getty Images for Bechtel). (BrightSource)

KEVIN BULLIS - MIT Technology Review

(U.S. Geological Survey)

(Nomad_Soul/Shutterstock)

Alan Weisman (Bill Steen)

Weisman: We're the problem

A camera trap set out for endangered Siberian (Amur) tigers in the Russian Far East photographed something far more rare: a golden eagle capturing a young sika deer (Linda Kerley, Zoological Society of London (ZSL))

(M.M./Shutterstock)

(Timof/Shutterstock)

Lynn Berry, Alexander Roslyakov

Jocelyn C. Zuckerman

Van Jones, former Obama's Advisor for Green Jobs, Enterprise and Innovation, speaks at the Mobilization to End Poverty conference April 27, 2009 in Washington, DC. (Ryan Rodrick Beiler/Shutterstock)

(U.S. Geological Survey)

Gillian Flaccus

(Aleksandar Mijatovic/Shutterstock)

Francie Diep - Popular Science

(Feng Yu/Shutterstock)

A slow loris "talks dirty" to the pop star (badgirlriri/Instagram)

(<a href='http://www.shutterstock.com/gallery-1198163p1.html'>everything possible</a> via <a href='http://www.shutterstock.com/'>Shutterstock</a>)

Sponsored by Siemens

(Starbucks)

(<a href='http://www.istockphoto.com/user_view.php?id=2384286'>plastic_buddha</a> via <a href='http://www.istockphoto.com/'>iStock</a>)

Birth control will save us

Elizabeth Royte - OnEarth

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