£6.50 for a loaf of bread, £7 for a box of cornflakes and £18 for a pint of beer - these are the eye watering prices we could face in 2030 unless urgent action is taken to prevent dangerous climate change.

The figures were published today by Friends of the Earth, 40 days before vital UN climate talks kick off in Copenhagen.

The price of staple foods is set to rocket four and a half times above normal inflation because the changing climate will put extra stress on land and resources around the world, exacerbating the existing food crisis. Yields of crops like wheat, rice and maize will fall and patterns of trade and consumption will be affected.

Spiralling costs of basics like bread, rice and pasta will mean that many million more people will struggle to buy enough food to keep healthy.

The figures have been produced by Ray Hammond, a leading expert in predicting future social and economic trends and Visiting Lecturer at the University of Oxford's Institute for the Future of Humanity. He modeled the future prices of consumer foodstuffs for Friends of the Earth using previous price hikes recorded by the World Bank and projections by the International Food Policy Research Institute.

Projected prices of other staple foods in 2030 include: · £6.48 for a 800g loaf of white bread (now 72p, would be £1.44 with normal inflation) · £17.91 for a 1 litre corn oil (now £1.99, would be £3.98 with normal inflation) · £15.21 for 1 kg of basmati rice (now £1.69, would be £3.38 with normal inflation) · £7.20 for 500g corn flakes (now 78p, would be £1.56 with normal inflation) · £16.02 for 24 Weetabix-style biscuits (now £1.78, would be £3.56 with normal inflation) · £18.45 for a pint of Pilsner lager (now £2.05, would be £4.05 with normal inflation) As pressure mounts ahead of the United Nations climate change talks in Copenhagen, the report is a reminder that global warming will hit ordinary Britons hard, as well as causing storms, droughts, famine and floods that will affect the developing world.

In his report, Hammond echoes Friends of the Earth's call for a strong and fair agreement in Copenhagen, in which rich countries promise to cut their emissions by at least 40 per cent by 2020 without carbon offsetting, and pledge sufficient public funds to enable poor nations to develop cleanly and adapt to the impacts of climate change. He also advises urgent political action to address the underlying causes of the food crisis.

Ray Hammond said: "Our global food production is already precarious - and climate change threatens to tip it into disaster.

"£6.50 for a loaf of bread, £7 for a bag of pasta and £18 for a pint of lager - this is what the future looks like in Britain if we don't prevent dangerous climate change.

"Rich countries must take strong and decisive action to propel us towards a strong and fair agreement in Copenhagen in December - otherwise many people in the UK will face a Dickensian struggle to afford food and millions of people in the developing world will be condemned to early deaths."

Friends of the Earth Head of Climate Mike Childs said: "This vision of life in 2030 shows that life with climate change won't be pretty, it'll be pricey - the cost of simple foods like bread and rice will rocket and millions more people will go hungry here in the UK alone.

"There is still time to avert this nightmare scenario. At the UN climate talks in Copenhagen in just 40 days, rich countries must show leadership by stumping up hard cash for developing countries to grow cleanly and adapt to the effects of climate change already putting millions of lives at risk.

"Rich nations must also slash their emissions first and fast - cutting them by at least 40 per cent by 2020, without offsetting, to get us on the road to a strong and fair climate agreement which will safeguard the future of our planet and everyone on it."

"The root causes of the food crisis must also be tackled. We need urgent political action to create fair global food supplies and make farming planet- friendly - from field to fork our food currently creates up to half of all greenhouse gas emissions."