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Hundreds of thousands of people around the world marched on Sunday to call for the world to take action against climate change.

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The marches came a day before the globe's top leaders are set to gather in Paris for a crucial UN summit on climate change. Protesters took to the streets in London and Berlin; in Australia and Africa and Asia, and in cities across the U.S. There were more than 2,000 events across the globe. Organizers estimated that at least 570,000 people participated.

BERLIN, GERMANY - NOVEMBER 29: Activists participate in the Global Climate March on November 29, 2015 in Berlin, Germany. The COP21 2015 Paris Climate Conference will begin on November 30, though due to the recent Paris terror attacks French police have banned activists from marching in Paris. Large-scale marches are instead taking place in other cities, including today in Berlin. (Photo by Carsten Koall/Getty Images)
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BERLIN, GERMANY - NOVEMBER 29: Activists participate in the Global Climate March on November 29, 2015 in Berlin, Germany. The COP21 2015 Paris Climate Conference will begin on November 30, though due to the recent Paris terror attacks French police have banned activists from marching in Paris. Large-scale marches are instead taking place in other cities, including today in Berlin. (Photo by Carsten Koall/Getty Images)
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BERLIN, GERMANY - NOVEMBER 29: Activists participate in the Global Climate March on November 29, 2015 in Berlin, Germany. The COP21 2015 Paris Climate Conference will begin on November 30, though due to the recent Paris terror attacks French police have banned activists from marching in Paris. Large-scale marches are instead taking place in other cities, including today in Berlin. (Photo by Carsten Koall/Getty Images)
Getty Images
BERLIN, GERMANY - NOVEMBER 29: Activists participate in the Global Climate March on November 29, 2015 in Berlin, Germany. The COP21 2015 Paris Climate Conference will begin on November 30, though due to the recent Paris terror attacks French police have banned activists from marching in Paris. Large-scale marches are instead taking place in other cities, including today in Berlin. (Photo by Carsten Koall/Getty Images)
Getty Images
BERLIN, GERMANY - NOVEMBER 29: Activists participate in the Global Climate March on November 29, 2015 in Berlin, Germany. The COP21 2015 Paris Climate Conference will begin on November 30, though due to the recent Paris terror attacks French police have banned activists from marching in Paris. Large-scale marches are instead taking place in other cities, including today in Berlin. (Photo by Carsten Koall/Getty Images)
Getty Images

In Paris itself, though, climate marchers had to face off against police who were enforcing a protest ban enacted by president Francois Hollande. Protesters placed tens of thousands of shoes on the Parisian streets to symbolize where their bodies would have been.

Others formed a human change tens of thousands of people long.

Of course, some people still wanted to march. In response, police used tear gas and pepper spray on them.

All in all, over 200 people were detained in Paris.