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Up to half of world's food wasted

Jan 10 2013 18:40 Reuters

In Britain, about $16.3bn worth of food is thrown away every year.

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London - Up to half of all the food produced worldwide ends up going to waste due to poor harvesting, storage and transport methods as well as irresponsible retailer and consumer behaviour, a report said on Thursday.

The world produces about four billion metric tonnes of food a year but 1.2 to 2 billion tonnes is not eaten, the study by the London-based Institution of Mechanical Engineers said.

"This level of wastage is a tragedy that cannot continue if we are to succeed in the challenge of sustainably meeting our future food demands," said.

In developed countries, like Britain, efficient farming methods, transport and storage mean that most of the wastage occurs through retail and customer behaviour.

Retailers produce 1.6 million tonnes of food waste a year because they reject crops of edible fruit and vegetables because they do not meet exacting size and appearance criteria, the report by the engineering society said.

"Thirty percent of what is harvested from the field never actually reaches the marketplace (primarily the supermarket) due to trimming, quality selection and failure to conform to purely cosmetic criteria," it said.

Of the food which does reach supermarket shelves, 30-50% of what is bought in developed countries is thrown away by customers, often due to poor understanding of "best before" and "use by" dates.

A "use by" date is when there is a health risk associated with using food after that date. A "best before" date is more about quality - when it expires it does not necessarily mean food is harmful but it may lose some flavour and texture.

However, many consumers do not know the difference between the labels and bin food after "best before" dates.

Promotional offers and bulk discounts also encourage shoppers to buy large quantities in excess of their needs.

Rising population

In Britain, about £10.2bn ($16.3bn) worth of food is thrown away from homes every year, with £1bn worth being perfectly edible, the report found.

By contrast, in less developed countries, such as in sub-Saharan Africa or South East Asia, wastage mostly happens due to inefficient harvesting and poor handling and storage.

In South-East Asian countries, for example, losses of rice range from 37-80% of their entire production, totalling about 180 million tonnes per year, the report said.

The United Nations predicts global population will peak at around 9.5 billion people by 2075, meaning there will be an additional 2.5 billion people to feed.

The rising population, together with improved nutrition and shifting diets will put pressure for increases in global food supply over the coming decades.

Rising food and commodity prices will drive the need to reduce waste, making the practice of discarding edible fruit and vegetables on cosmetic grounds less economically viable.

However, governments should not wait for food pricing to trigger action on this wasteful practice, but produce policies that change consumer behaviour and dissuade retailers from operating in this way, the study said.

Rapidly developing countries like China and Brazil have developed infrastructure to transport crops, gain access to export markets and improve storage facilities but they need to avoid the mistakes made by developed nations and make sure they are efficient and well-maintained.

Poorer countries require significant investment to improve their infrastructure, the report said. For example, Ethiopia is considering developing a national network of grain storage facilities which is expected to cost at least $1bn.

"This scale of investment will be required for multiple commodities and in numerous countries, and co-ordinated efforts are going to be essential," the report said.

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