In his new movie, “Human Flow,” artist and human rights activist Ai Weiwei documents the plight of refugees struggling in a hot and crowded world. Greg also talks to an artist who uses music to convey emotional urgency around climate disruption. Bill Collins, Scientific Advisor, Lawrence Berkeley National Laboratory Stephan Crawford, Founder, The Climate Music Project Ai Weiwei, Artist and Activist This program was recorded at the Commonwealth Club in San Francisco, CA.

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