The world is likely to face major disruption to food supplies well before temperatures rise by the 1.5C target, the president of the UN’s desertification conference has warned, as the impacts of the climate crisis combine with water scarcity and poor farming practices to threaten global agriculture.

Alain-Richard Donwahi, a former Ivory Coast defence minister who led last year’s UN Cop15 summit on desertification, said the effects of drought were taking hold more rapidly than expected.