the plight of indigenous groups was a major protesting point, as deforestation continues to threaten many tribes in the brazilian amazon. high profile leaders david cameron and barrack obama did not attend the summit, provoking allegations that their respective governments do not view sustainability as a priority.  

the official rio+20 website can be viewed via this link.

another interesting website, related to rio+20, is the passaporte verde  (green passport) website - accessible here.