Delegates from 149 World Trade Organization economies are trying to spark new life into free trade as talks formally open Tuesday.

U.S Trade Representative Robert Portman says rich countries should make the kinds of concessions on agriculture markets that less developed countries demand. "The United States made a bold agriculture proposal back in October," he said. "It has yet to be matched in boldness by others, including the European Union."

EU Skeptical About Agriculture Deal at World Trade Talks

However, European Union Trade Commissioner Peter Mandelson has all but ruled out a conclusive deal from this week's talks. He says the WTO meeting is focusing too heavily on agriculture, and that the EU will not make any new offers on the issue.

EU Skeptical About Agriculture Deal at World Trade Talks

Although the WTO conference does not formally open until Tuesday afternoon, delegates have begun informal talks. They are expected to negotiate nearly around the clock until the meeting ends on Sunday.

EU Skeptical About Agriculture Deal at World Trade Talks