Campaigners call Rio+20 summit a `` hoax '' and a `` failure of epic proportions '' because it failed to address the root causes of global warming U.N. Secretary-General Ban Ki-moon About 100 heads of state and government were among roughly 40,000 delegates who attended the meeting , which the U.N. called an `` historic opportunity to define pathways to a safer , more equitable , cleaner , greener and more prosperous world for all . '' says Rio+20 `` affirmed fundamental principles '' $ 513 billion has been committed to a number of causes , the United Nations says .
Campaigners call Rio+20 summit a `` hoax '' and a `` failure of epic proportions '' because it failed to address the root causes of global warming U.N. Secretary-General Ban Ki-moon says Rio+20 `` affirmed fundamental principles '' $ 513 billion has been committed to a number of causes , the United Nations says .