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2019·“中国移动‘和教育’杯”第二十届全国中小学电脑制作活动高中组计算机程序设计一等奖。
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A vegetarian diet is often praised for its health benefits A vegetarian diet is often praised for its health benefits. Vegetarians usually have lower levels of heart disease, and studies have also shown that they have a lower risk of diabetes than people who eat meat. However, most people don’t realize that a vegetarian diet produces less pollution to the earth. Researchers from the Union of Concerned Scientists in the US recently studied how people affect the environment. The study showed that eating meat is one of the main ways that humans can change the environment, second only to the use of motor vehicle. Then, how can eating meat have a negative effect on the environment? For a start, all farm animals such as cows, pigs, and sheep give off methane gas by breathing. One cow can produce up to 60 liters of methane each day. Methane gas is the second most common greenhouse gas after carbon dioxide. Many environmental experts now believe that it is more responsible for global warming than carbon dioxide. It is estimated that 25% of all methane released into the air comes from farm animals. Another way that meat production affects the environment is through the use of water and land. 2,500 gallons of water are needed to produce one pound of beef while only 20 gallons of water are needed to produce one pound of wheat. One acre of farmland used for crop production can produce 40, 000 pounds of potatoes, 30,000 pounds of carrots, or 50,000 pounds of tomatoes, however, one acre of farmland used for raising cows can produce just 250 pounds of beef. Many people now see the benefits of a vegetarian diet, not just for health reasons, but also because it plays an important role in protecting the environment. However, some nutritionists advise against switching to a totally strict vegetarian, or vegan diet. They believe a vegan diet, which excludes all products from animal sources, such as cheese, eggs, and milk, can be short of many necessary vitamins and minerals our bodies need.
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