Musicians, artists and activists lended their unique voices to the issue of climate change at the Pathway To Paris concerts at The Masonic in San Francisco and the ACE Theatre in Los Angeles over the weekend, a closing act of the Global Climate Action Summit in California.

This year's concerts, a collaboration with 350.org and the United Nations Development Programme (UNDP), featured legendary punk rocker Patti Smith, Bob Weir of the Grateful Dead, Karen O of the Yeah Yeah Yeahs, Flea of the Red Hot Chili Peppers, skateboarding icon Tony Hawk, hip-hop artist Talib Kweli, artists Olafur Eliasson and Steven Sebring, 350.org founder Bill McKibben and many other high-profile guests and environmental activists.