World leaders warned on Tuesday that the Ukraine war risked creating a new era of divisions at a time when worsening climate change and rising food prices risk unleashing new instability. The UN General Assembly, the annual gathering of world leaders that clogs Midtown Manhattan, returned in person after two years of pandemic restrictions with only one leader allowed to appear virtually – Ukrainian President Volodymyr Zelensky. UN Secretary General Antonio Guterres opened the summit by projecting images of a ship carrying grain out of Ukraine – evidence of how diplomacy can succeed – as he war…