A top United Nations official says the final statement for the organization's largest-ever conference is far from ready.
The outcome document for the Rio+20 summit on sustainable development was supposed to be 90 percent completed ahead of the conference, but bickering between rich and poor nations has plagued negotiations.
Nikhil Seth, director of the U.N.'s Division for Sustainable Development, says consensus has been reached on just 28 percent of the outcome document. Seth, speaking Friday in host city Rio de Janeiro, said talks were continuing but acknowledged progress was slow.
An estimated 130 heads of state are expected in Rio for the summit's three final days from June 20-22, culminating in the signing of the final document.
Top U.N. officials say a successful Rio+20 is crucial for the earth's future.