“And it does not do any good to cite large ambitious promises many years out, and then behind the scenes to say ‘we’re not
going to talk about how they’re going to be fulfilled.” Jeffrey Sachs, the
Columbia University economist and special adviser to UN Secretary-General Ban Ki-moon.

http://www.bbc.co.uk/news/science-environment-18561223

 

 

This seems to be an appropriate summation of Rio+20