G-20 world leaders meeting in Seoul, South Korea, concluded the summit late Friday by issuing a joint communiqué, with no specifics, agreeing only in general terms to curb “persistently large imbalances” in saving and spending. But deep divisions, especially over the US-China currency dispute, left G-20 officials negotiating all night to draft a watered-down statement for the leaders to endorse, keeping alive a dispute that raises fears of a global trade & currency war, and fears of rising protectionism among nations.