A sign announces that the power generators at the conference run on 20% Brazilian biodiesel. United Nations Conference on Sustainable Development (Rio+20), Rio de Janeiro, Brazil, 14th June 2012. Photo © Sue Cunningham.

- Image ID: CA6651

A sign announces that the power generators at the conference run on 20% Brazilian biodiesel. United Nations Conference on Sustainable Development (Rio+20), Rio de Janeiro, Brazil, 14th June 2012. Photo © Sue Cunningham.

Sue Cunningham Photographic / Alamy Stock Photo

Image ID: CA6651

Location: Rio de Janeiro, RJ, Brazil