Climate change is causing ice to melt and sea levels to rise, threatening billions of people along with world’s coastlines, including 150 million Americans. Friends of Global Green USA, including Mark Ruffalo, Adrian Grenier, Orlando Bloom, Serena Williams, Ed O'Neill, James Cameron, Suzy Amis, Nia Vardalos, Kyra Sedgwick, Kevin Bacon, Mark McGrath, Ed Begley Jr., Esai Morales and Billy Morrison, are helping to spread the word with this public service announcement.