Drop in UK self sufficiency shows clear signal of climate impacts: comment

“The decline in UK self sufficiency shows a clear signal of climate change. With production and imports of key commodities largely flat, the reduction in self sufficiency between 2024 and 2025 has been driven by a change in the value of key commodities. The value of exports fell, mainly because whisky exports were worth less. [3] At the same time, imports increased, driven partly by a nearly 20% rise in the value of tea and coffee imports, with imported tea and coffee costing over a billion pounds more in 2025 than in 2024. 
 
“Coffee is amongst the most climate impacted crops in recent years, with droughts in key producing countries Brazil and Vietnam driving up the global commodity price by as much as 100% in 2025 compared to 2024. [4] There was also a jump in the value of cereal imports after the 2025 drought caused England's second worst harvest on record, [5] which has once again hit our self sufficiency in wheat for the second successive year. [6] The value of beef imports is another big riser, following a spike in the global beef price, partly driven by drought in the United States, the world’s biggest beef market. Extreme weather made worse by climate change is now having globally significant impacts on our food system, and much greater urgency is needed to reduce our emissions to net zero and bring our climate back into balance.”

The food production to supply ratio is calculated by estimating total supply, which is imports plus domestic production, minus exports. And then estimating the percentage of that total supply made up by domestic production. Defra estimate this for all foods and for indigenous type food which could feasibly be produced in the UK. The headline indicator is calculated by value, meaning big swings in global commodity prices caused by extreme weather, energy shocks or interruption in trade caused by tariffs can have a bigger influence on it than changes in domestic production. The production to supply ratio for different sectors and crops by volume suggests little overall change in UK farming output between 2024 and 2025. 
 
These changes in import values are small relative to the whole UK economy, but they matter for GDP directly because net trade is one of the components of GDP. GDP is measured as consumption plus investment plus government spending plus exports minus imports. When the same volume of coffee or beef costs more to import, and this is not offset by higher export earnings, the imports term rises and net trade falls. In that sense, a climate-driven increase in the food import bill will weigh on GDP.