TF写作真题第038套（nt011）

NT_011

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综合写作NT 011音频

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Plastic debris in the oceans is huge environmental concern. Recently, it has been proposed that device called an Ocean Cleanup Array (OCA) could collect and remove plastic from the oceans.this device consists of floating barriers 3 meters deep and 100 kilometers long. The barriers are anchored to the ocean floor, and natural ocean currents carry the plastic toward the barriers, where the plastic is pooled and collected. The designers of this system claim that it will allow for efficient cleanup, with little negative effect on the environment, for several reasons.

Cost

First, the brilliance of this device is that it does not expend much energy because it makes use of natural ocean currents to bring the plastic to it. Its functioning is therefore quite inexpensive compared with other ocean cleanup methods. For a cost of about 400 million dollars, one device can remove up to 7 million kilograms of plastic every year. This is about 30 times less expensive per unit of plastic removed than any other ocean cleanup method.

Minimal Impact on Marine Life

Second, other cleanup methods often rely on nets, which can entangle and injure marine animals.the floating barriers of the OCA are solid and fixed in one location, meaning that swimming animals can easily avoid them and will not get caught or trapped by the structure.thus, there be minimal impact on marine life.

Recycling

Finally, the large quantities of plastic that will be collected by the device can be recycled. The two most common types of plastic in the ocean are polyethylene and polypropylene. Each of these types of plastic can be processed by recycling plants. Plastic collected from the ocean can therefore be sold to recycling facilities.

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