Acute food insecurity is set to increase in scale and severity in 18 hunger hotspots, a new United Nations early warning report said on Wednesday. The report highlights the urgent need for humanitarian assistance to prevent famine in Gaza and Sudan, and further deterioration of the devastating hunger crises in Haiti, Mali and South Sudan. It also warns of the lingering effects of El Niño and the looming threat of La Niña, bringing more climate extremes that could disrupt livelihoods.