CNBC update: Rousseff impeached

10:32 AM ET Thu, 12 May 2016

The World Health Organization warns pollution is responsible for seven million premature deaths per year; and George Zimmerman will auction the gun used in the shooting of Trayvon Martin, and use some of the proceeds to challenge Hillary Clinton's gun control policies; and Brazil's senate has voted to impeach President Dilma Rousseff, reports CNBC's Sue Herera.