By: Mark Leon Goldberg on May 23, 2012 One month from now, world leaders, civil society activists, businesspeople and diplomats will descend on Rio de Janeiro for the United Nations Conference on Sustainable Development, better known as Rio+20. I recently spoke with Dr. Gustavo A. B. da Fonseca of the Global Environment Facility. Dr. Fonseca is a veteran of global struggle for sustainable development and was a participant in the original Rio meeting two decades ago. Dr. Fonseca penned an essay in The Greenline that caught my attention. In the article, Fonseca argues that the real measure of success in Rio next month will not be found in the official outcome documents, but in the ideas hatched and partnerships formed around discrete areas of sustainable development. In this UN Dispatch podcast, Dr Fonseca explains why he is convinced the global conference will succeed. Have a listen.