A UN official has warned that tens of millions of people could be pushed toward hunger and starvation unless fertilisers are allowed to move through the Strait of Hormuz in the coming weeks, underscoring the mounting risk of a global food crisis. Iran has effectively held the strategic waterway in a chokehold for months, after the war launched by the United States and Israel on 28 February, disrupting a corridor that normally carries a third of the world's fertilisers. The obstruction has rattled a supply chain farmers…