The report, by the International Food Policy Research Institute, warned that warming of even one degree by 2050 could play havoc with food production - with hotter, wetter temperatures cutting crop yields.
With a global population of 9 billion forecasted by the middle of the century, the effects of lower crop yields could be devastating - especially if income growth faltered in developing countries, the report warned.
This year's drought and wildfires in Russia and the massive floods in Pakistan provided a window into a future of extreme weather conditions.
So did the food unrest of the last few years.
"The food price spikes of 2008 and 2010 both had important weather components," Gerald Nelson the report's co-author said.
In the world's poorest countries, average calorie intake would fall significantly, even by 2025. By the middle of this century, child malnutrition could rise by 18%. Read the full report here.
Soure: Suzanne Goldberg, US environment correspondent, guardian.co.uk.
