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As far as the greenhouse effect is concerned, the author______.
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The higher you stand, ______.
The management of logistical (物流的) operation is about movement and storage of materials and finished products. Logistical operations start with the initial shipment of a material or component part from a supplier and are finished when a manufactured or processed product is delivered to a customer.
From the initial purchase of a material or component, the logistical process adds value by moving inventory (移动库存) when and where needed. If all goes well, a material gains value at each step of its transformation into finished inventory. In other words, an individual part has greater value after it is put into a machine. Likewise, the machine has greater value once it is delivered to a buyer.
To support manufacturing, work-in-process inventory must be moved to support final assembly. The cost of each component and its movement becomes part of the value-added process. The final or meaningful value that is added occurs only with final ownership transfer of products to customers when and where specified.
For a large manufacturer, logistical operations may consist of thousands of movements, which finally develop into the delivery of products to an industrial user, retailer, wholesaler, dealer, or other customer. For a large retailer, logistical operations may start with gaining products for resale and may finish with consumer pickup or delivery. For a hospital, logistics starts with purchasing and ends with full support of patient surgery and recovery. The significant point is that regardless of the size and type of enterprise, logistics is essential and requires continuous management attention. For better understanding it is useful to divide logistical operations into three areas: physical distribution, manufacturing support, and procurement(筹措、采购) .
Logistical operations are concerned with______.
Once somebody thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In-fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a greenhouse effect—holding in heat reflected from the earth and raising the world's average temperature. If this view is correct and the world's temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.
Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth's temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.
This passage is mainly concerned with______.
The main idea of the passage is about______.
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