Answer:

How the changing costs of Surprise's recycling program led the city to cancel it. ... 19, citing both rising costs and the plunging value of recyclables. Surprise recycled nearly 13 million pounds of material last year, according to Waste Management, the company that the city uses to process its recyclables.

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The main reason of a substance being biodegradable is being organic that can be used up by scavengers of environment. On the other hand some substances are non biodegradable because they are synthetic and cannot be decomposed by the microorganism