Banners which read "Paris marches for climate change" are displayed in front of pairs of shoes placed at the Place de la Republique in Paris
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UN climate conference: Empty shoes replace cancelled Paris march

Nearly 150 global leaders are gathering in Paris amid tight security for a critical UN climate meeting.

The conference, known as COP21, starts on Monday and will try to craft a long-term deal to limit carbon emissions.

Meanwhile Parisians have been placing hundreds of pairs of shoes at the Place de la Republique in the French capital.

Emma Ruby-Sachs of the Avaaz campaign group explained the reasons for the gesture.

Go to next video: A brief history of climate talks