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French President Emmanuel Macron delivers a speech during the 'Tech for Planet' event at the 'Station F' start-up campus ahead of the One Planet Summit in Paris on December 11, 2017.  / AFP PHOTO / POOL / PHILIPPE WOJAZER        (Photo credit should read PHILIPPE WOJAZER/AFP/Getty Images)
French President Emmanuel Macron delivers a speech during the 'Tech for Planet' event at the 'Station F' start-up campus ahead of the One Planet Summit in Paris on December 11, 2017.  / AFP PHOTO / POOL / PHILIPPE WOJAZER        (Photo credit should read PHILIPPE WOJAZER/AFP/Getty Images)

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    Leaders gather on Paris Accord anniversary

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Leaders gather on Paris Accord anniversary

On the two-year anniversary of the Paris Accord, world leaders are gathering in the French capital for the "One Planet" summit to discuss stepping up efforts against global warming. CNN's Melissa Bell has more.

Leaders gather on Paris Accord anniversary

On the two-year anniversary of the Paris Accord, world leaders are gathering in the French capital for the "One Planet" summit to discuss stepping up efforts against global warming. CNN's Melissa Bell has more.