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In this August 2015 file photo, plants burned in the Rocky Fire are shown near Lower Lake, Calif. NPR's environment and climate change reporting encompasses related topics such as wildfires, drought, and other natural disasters. Jeff Chiu/AP hide caption

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Jeff Chiu/AP

Former NPR science correspondent (and now host of Science Friday) Ira Flatow interviews a few penguins while reporting from Antarctica in 1979. NPR's environment reporting has increased and expanded greatly since. Katherine Bouton/IraFlatow.com hide caption

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Katherine Bouton/IraFlatow.com

Members of the WDBJ-TV7 news staff prepare for the early newscast at the station, the morning after reporter Alison Parker and cameraman Adam Ward were killed by a former colleague during a live broadcast. Steve Helber/AP hide caption

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Steve Helber/AP

A migrant arrives with his son on the shore near the village of Skala Sikaminea, on the southeastern Greek island of Lesbos, Greece on Friday. Greece this year has been overwhelmed by record numbers of migrants arriving on its eastern Aegean islands, with more than 160,000 landing so far. [Caption from AP, lightly edited.] Visar Kryeziu/AP hide caption

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Visar Kryeziu/AP

President Obama signs the Defending Public Safety Employees' Retirement Act, which includes fast track trade promotion authority that allows Obama to negotiate trade treaties, including the Trans Pacific Partnership. SAUL LOEB/AFP/Getty Images hide caption

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SAUL LOEB/AFP/Getty Images