2. Unlike conventional farming, the organic approach means farming with natural rather than man-made, fertilizers and pesticides. Techniques such as crop rotation (轮种) improve soil quality and help organic farmers compensate for the absence of man-made chemicals. As a method of food production organic is, however, inefficient in its use of labor and land; there are severe limits to how much food can be produceD.Also, the environmental benefits of not using artificial fertilizers are tiny compared with the amount of carbon dioxide emitted (排放) by transporting food.
3. Organic farming is often claimed to be safer than conventional fanning. Yet studies into organic fanning worldwide continue to reject this claim. An extensive review by the UK Food Standards Agency found that there was no statistically significant difference between organic and conventional crops. Even where results indicated there was evidence of a difference, the reviewers found no sign that these differences would have any noticeable effect on health.
4. The simplistic claim that organic food is more nutritious than conventional food was always likely to be misleading. Food is a natural product, and the health value of different foods will vary for a number of reasons including freshness, the way the food is cooked, the type of soil it is grown in the amount of sunlight and rain crops have received, and so on. Likewise, the flavor of a carrot has less to do with whether it was fertilized with manure (粪便) or something out of a plastic sack than with the variety of carrot and how long ago it was dug up.
【2013年职称英语考试《卫生类A级》考试真题】相关文章:
最新
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02