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BADEN-BADEN, GERMANY - MAY 25: Former US president Barack Obama is seen during the German Media Award 2016 (Deutscher Medienpreis 2016) at Kongresshaus on May 25, 2017 in Baden-Baden, Germany. The German Media Award (Deutscher Medienpreis) has been presented annually since 1992 to honor personalities from public life. (Photo by Alexander Scheuber/Getty Images)
BADEN-BADEN, GERMANY - MAY 25: Former US president Barack Obama is seen during the German Media Award 2016 (Deutscher Medienpreis 2016) at Kongresshaus on May 25, 2017 in Baden-Baden, Germany. The German Media Award (Deutscher Medienpreis) has been presented annually since 1992 to honor personalities from public life. (Photo by Alexander Scheuber/Getty Images)

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Obama: Climate change may define the century

Former President Barack Obama says climate change is a "threat that may define the contours of this century more than any other."

Obama: Climate change may define the century

Former President Barack Obama says climate change is a "threat that may define the contours of this century more than any other."