Negotiators hunkered down in Indonesia on Monday, trying to bridge differences and agree to a plan for a U.N. summit that aims to drag millions out of poverty while protecting the environment. Critics have predicted the World Summit on Sustainable Development in Johannesburg in August would be a flop unless the current Bali meeting revamped a draft agenda, which they say doesn't go far enough to help the world's 1.2 billion people living in poverty.