According to Oxfam, climate change is leading to increasingly erratic weather patterns and threatening food security in many parts of the world, as a result.
Last year's drought in Russia had the impact of pushing up global grain prices by as much as 85 per cent, the Press Association reports, with monsoon floods in South East Asia having a similar effect on rice prices.
The charity was speaking ahead of the latest UN climate talks, which are due to be held in Durban, South Africa.
Kelly Dent, a representative of Oxfam, was quoted as saying: "This will only get worse as climate change gathers pace and agriculture feels the heat.
"Governments must act now in Durban to protect our food supply and save millions from slipping into hunger and poverty."
With rising food prices and general inflation taking their toll on UK consumers, the Royal Society of Chemistry recently recommended the 'toast sandwich' as the cheapest lunch.