Thousands people participate in &quot;People's Climate March&quot; a climate change awareness march and rally, in Los Angeles, Saturday, April 29, 2017. The gathering was among many others of its kind held nationwide marking President Donald Trump's 100th day in office.(Photo by Ringo Chiu/PHOTOFORMULA.com)<br /> <br /> Usage Notes: This content is intended for editorial use only. For other uses, additional clearances may be required.
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