In February 2023, the Brazilian government sank a retired aircraft carrier in the Atlantic Ocean. Scrapping the rusting hulk in the usual way had became difficult and prohibitively costly, the Brazilian government decided, in part because hazardous materials like asbestos used in the boat's construction had pushed up disposal costs.The episode is an extreme example of a common problem: how can designers of large, complex machines take into account the overall environmental impact of construct...

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