Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. The collapse of two dams at a Brazilian mine, owned by Vale SA and BHP Billiton Ltd, has cut off drinking water for quarter of a million people and saturated waterways downstream with dense orange sediment that could wreck the ecosystem for years to come. Nine people were killed, 19 are still listed as missing and 500 people were displaced from their homes when the dams burst at an iron ore mine in southeastern Brazil on November 5. (Photo by Sergio Moraes/Reuters)





An environmental activist performs during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists chant slogans during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists are reflected on glass panels as they perform during protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





An environmental activist throws mud at a logo of Brazilian mining company Vale SA in front of the headquarters of the company in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





Environmental activists perform during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)





An environmental activist performs during a protest in front of the headquarters of Brazilian mining company Vale SA in downtown Rio de Janeiro, Brazil, November 16, 2015. (Photo by Sergio Moraes/Reuters)