Participants with protest signs at rally for Science on Earth Day, 22 April 2017, in Tucson, Arizona, USA.

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Photo credit: © Wild Horizons/UIG/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: 2017, activism, activists, amendment, american, arizona, awareness, citizens, day, demonstration, dissention, earth, expression, freedom, gathering, march, movement, news, people, political, power, protest, pubic, public, rally, resistance, rights, science, signs, speech, states, tucson, understanding, united, usa