Caciques Raoni Metuktire and Megaron Txucarramae, Kayapo tribal chiefs from Brazil, visit the UK in June 2014. The Chiefs on the streets of London, visiting Parliament and outside St James's Palace. With additional images from the 2012 UNCSD United Nations Sustainable Development summit in Rio de Janeiro, Belo Monte hydroelectric dam protests in Altamira, Belem, London, and deforestation threats - illegal mining, ranching, logging.