Earth: NASA / ​ The Visible Earth (http: / / ​ visibleearth.nasa.gov /); Barack Obama: ATTILA KISBENEDEK / ​ AFP / ​ Getty Images
Earth: NASA / ​ The Visible Earth (http: / / ​ visibleearth.nasa.gov /); Barack Obama: ATTILA KISBENEDEK / ​ AFP / ​ Getty Images