US President Barack Obama, right, and German Chancellor Angela Merkel walk to a group photo of G-7 leaders and Outreach guests at the G-7 summit in Schloss Elmau hotel near Garmisch-Partenkirchen, southern Germany on Monday.
US President Barack Obama, right, and German Chancellor Angela Merkel walk to a group photo of G-7 leaders and Outreach guests at the G-7 summit in Schloss Elmau hotel near Garmisch-Partenkirchen, southern Germany on Monday. Carolyn Kaster AP
US President Barack Obama, right, and German Chancellor Angela Merkel walk to a group photo of G-7 leaders and Outreach guests at the G-7 summit in Schloss Elmau hotel near Garmisch-Partenkirchen, southern Germany on Monday. Carolyn Kaster AP

Opinion

June 12, 2015 7:48 AM

Can the world have a carbon-free future?

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