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1.2. The double-edged solid waste

Solid waste is a term of temporal and spatial dimensions. In terms of temporal dimensions, at certain moment, a kind of solid waste may be unable to recycled or reused due to inadequate technologies. However, with the development of technologies and the lack of raw materials, the trend of using solid waste as resources is inescapable. From the spatial perspective, the discarded waste that is useless in certain place may be recycled and reused in other places. Therefore, the waste is called as "the misplaced resources."45

The negative environmental impact of solid waste

On the one hand, solid waste is harmful to the environment. If not being properly handled, with the influence from the nature, the hazardous components of solid waste will enter into the ecosystem by polluting the air, water and soil. Some pollutants can be accumulated in organic bodies, which will pose potential risks to human health. The negative environmental impacts of solid waste can be embodied in the following ways:46

Firstly, solid waste will lead to the encroachment of valuable spaces. The dumping of waste takes more and more valuable land space. It is estimated that 10 thousands of solid waste may cover an area of 666.7 kilometers. (Qiu, 2007)

Secondly, solid waste will lead to water pollution. The dumping of solid waste may produce leachate, which is the liquid that forms as water trickles through contaminated areas leaching out the chemicals. For example, the leaching of landfill can result in a leachate containing a cocktail of chemicals. The movement of contaminated leachate may result in hazardous substances entering surface water, groundwater.

Thirdly, solid waste will cause soil contamination. Contaminants in the soil can harm plants when they take up the contamination through their roots. Ingesting, inhaling or touching contaminated soil, as well as eating plants or animals that have accumulated soil contaminants can adversely impact the health of humans and animals.

Last but not least, solid waste will incur air contamination. The biodegradation of waste will lead to the emission of toxic air. The transportation and disposal of waste will cause the dispersion of small articles. Air pollution can cause respiratory problems and other adverse health effects as contaminants are absorbed from the lungs into other parts of the body.

The positive aspect of solid waste

On the other hand, the reuse and recycling of solid waste in an proper way can bring environmental and economic benefits to people.

If recycled properly, solid waste is a kind of eco-friendly resources. For example, the waste paper can be converted to disposed paper at the rate of 10 to 8, thus replacing other raw materials and resources, such as wood, water, coal, and electricity.47 As human society has grown wealthier, it has created more and more rubbish. Higher living standards mean that people are buying more products. There are also more single-person households which tend to produce more waste per person than families or groups. Consumption has changed dramatically. Today, consumers have much more choice and products are designed to have shorter lifespans. There are also many more single-use and disposable products. Advances in technology mean that people own and use many more personal devices, and update them more often. These lifestyle changes may have increased our quality of life, but they also mean we are generating more waste than ever before. Therefore, it is essential to make use of solid waste, which will be the stock of raw materials for human being in the future.

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