Anger at 'lack of ambition' at Rio summit

World leaders say the agreement likely to come out of the UN Earth Summit in Rio de Janeiro is weak and unambitious, while poorer nations say it is a result of richer nations lack of commitment to the environment. Protesters outside the summit have been adding their voices to the criticism, as disappointment turns to anger. Tens of thousands of people have shown up in the Brazilian city, many of whom say what is happening on the sidelines of the gathering is what is really important. Al Jazeera's Lucia Newman reports from Rio de Janeiro.