General view of the "Global March" along Rio Branco avenue in Rio de Janeiro, Brazil, in the framework of the UN Rio+20 Conference on Sustainable Development. World leaders gathered in Rio on ... more 

General view of the "Global March" along Rio Branco avenue in Rio de Janeiro, Brazil, in the framework of the UN Rio+20 Conference on Sustainable Development. World leaders gathered in Rio on Wednesday weighed steps to root out poverty and protect the environment as UN chief Ban Ki-moon warned that "time is not on our side" for fixing a mounting list of problems less