Ahead of intense international climate negotiations at the Le Bourget centre in Paris, activists protested in absentia by lining the Place de la République outside the convention center with empty pairs of shoes.

Hundreds of pairs of shoes are displayed at the place de la Republique, in Paris, as part of a symbolic and peaceful rally called by the NGO Avaaz "Paris sets off for climate", Sunday, Nov. 29, 2015.  More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (AP Photo/Laurent Cipriani)

In light of the terrorist attacks on Paris earlier this month, city officials cancelled the protest for security reasons. Over 10,000 pairs of shoes now stand in place of the 200,000 participants originally expected to take part in Sunday’s march. The result is stunning in its silent impact.

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The U.N. Paris Climate Summit that begins today could become a landmark moment in the movement to combat climate change. World leaders will gather to negotiate a plan of action to tackle the issue, but ahead of the vitally important conversation, people around the world have gathered to send their leaders a clear message: The time to act is now.

Hundreds of pairs of shoes are displayed at the place de la Republique, in Paris, as part of a symbolic and peaceful rally called by the NGO Avaaz "Paris sets off for climate", Sunday, Nov. 29, 2015.  More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (AP Photo/Laurent Cipriani)

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