UNDP Dataset Projects Up to 30% Staple-Crop Yield Decline in Poorest Nations

A new UNDP climate dataset projected that 90% of assessed countries face substantial staple-crop yield declines, with low-HDI nations losing up to 30% by century's end under high-emissions scenarios. The findings underscore food security and livelihood risks that intensify climate inequality across developing and agriculture-dependent economies.

The United Nations Development Programme released a climate dataset, via the Human Climate Horizons platform, projecting that 90% of assessed countries will experience substantial staple-crop yield declines. The analysis covered six global staple crops: maize, rice, wheat, soy, cassava, and sorghum. Under high greenhouse gas emissions scenarios, median national crop yields in low-Human Development Index nations were projected to decline by up to 30% by century's end. Decisive moderate-emissions scenarios nearly halved projected crop losses by 2100.

Low-HDI nations face the steepest losses, with Sub-Saharan Africa and parts of Asia deemed especially vulnerable due to heavy reliance on rainfall limiting adaptation. Major "breadbasket" producing regions are also affected, where wheat and soy yield declines could reach 40% under severe warming, creating global food security ripple effects. The projections accounted for empirically observed local farmer adaptation strategies, yet declines remained, underscoring deep global climate inequality across agriculture-dependent economies.

Governments and stakeholders should treat the threat to agricultural productivity as a direct risk to food security and livelihoods, recognising that reducing emissions matters for food-system stability. The findings echoed the Belem Declaration on Hunger, Poverty, and Human-Centred Climate Action. Affected nations should pursue human-centred climate action and emissions reduction, since moderate-emissions scenarios nearly halved projected crop losses by 2100, offering the most equitable pathway toward resilient food systems for vulnerable populations.

Key figure — Yield projection: median crop yields in low-HDI nations could fall up to 30% by century's end under high emissions