yield enhancers and biofungicides can protect the land and crops and increase crop yields while leaving little or no residue in the food produced and this is the focus of the research and products being developed by biopesticides developers. Such low-chem agricultural products are gradually replacing the older generation of artificial fertilisers and pesticides which are being withdrawn or phased out by many governments around the world. However 长征五号失败调查 美团再遭举报

Food-and-Drink The use of oil and petroleum products in food production is a major factor in everything from synthetic fertiliser and pesticide production through processing and packaging right to final delivery in the shops. The industry is one of the biggest users of fossil fuels and therefore is often at the mercy of fluctuations in oil and petrol prices as well as being both energy inefficient and unsustainable as reserves of oil in the world are gradually being depleted. It is calculated that it takes more than 400 gallons of oil to feed one person for a year in the USA. Approximately a third of this goes to the manufacture of fertilisers, while another fifth is used in farm machinery. Add in the costs of the machinery that processes and packages the food and the transportation costs to the point of sale and these together explain that figure of 400 gallons per person per year. In terms of energy conversion this food production system means that it takes three calories of energy for every single calorie of edible food produced on average. The difference when this calculation is applied to grain-fed beef is an astonishing 35 calories of energy for every one calorie of beef. Both these figures exclude the additional cost of energy input involved in food processing and transportation. Those who advocate sustainable and organic farming point out that it is the industrial system of food production that accounts for what is argued to be such an inefficient use of energy. The chief culprit, they say, is the amount of energy that goes into producing artificial fertilisers and pesticides, derived from such things as nitrogen or natural gas. It is calculated that as much as 40% of the energy that goes into the food production system goes into this part of the process. It is also said that there is a need for these products because of the structure of the food production system, both meat and vegetables, which have become increasingly produced in concentrated and specific areas of many countries. Over the years this type of concentrated activity has depleted the nutrition of the soil, damaged ecosystems and polluted water supplies. There have also been increasing concerns about the long-term effects on human health of the residues of such chemicals in food. Farming systems like integrated pest management, organic farming and the use of more natural, low-chemical agricultural products are part of moving to more sustainable farming methods. Using natural sources for biopesticides, yield enhancers and biofungicides can protect the land and crops and increase crop yields while leaving little or no residue in the food produced and this is the focus of the research and products being developed by biopesticides developers. Such low-chem agricultural products are gradually replacing the older generation of artificial fertilisers and pesticides which are being withdrawn or phased out by many governments around the world. However, the process of getting this new, healthier generation of products tested, registered and licensed is both costly and lengthy. So far this process has also not been harmonised across the world and the need to do so is becoming increasingly urgent. Buying locally and organically produced food is another way to reduce the energy inefficiency in food production, as is reducing the amount of packaging used. While plainly consumers can take action about what they buy for themselves, they can also pressure the bigger food store chains to source more locally as well as to cut back on packaging. Copyright (c) 2011 Alison Withers About the Author: 相关的主题文章:

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