By Mr Weisman's reckoning, residential neighbourhoods would return to forest in 500 years and only the most stubborn of human inventions, such as certain plastics, would prove permanent.
按照韦斯曼的推测，住人的地区将会在500年内变回森林。只有那些最顽固的人类造物，比如某些塑料制品，才能保持不变。
Also the cost of alternatives, such as aluminum and certain plastics, is increasing.
而且铝和特种塑料等其他替代品的成本也在上升。
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