Proverbs such as "waste not, want not" seem to have fallen out of fashion in an era marked by the relentless extraction of natural resources - everything from metals to wood, food crops and building sand for the construction industry.Now, amid renewed warnings that global extraction levels are not sustainable, South African resource experts are also worried about the slow pace of domestic waste recovery and plans to establish a more resource-efficient "circular economy".The latest report by the UN's International Resource Panel notes that while the human population has doubled over the past 50 years, the rate of resource extraction has tripled.The 2019 Global Resources Outlook, compiled by a panel of 39 science experts, predicts that annual resource extraction could soar to 190-billion tons within the next four decades (more than double the current rate of 92-billion tons, and seven times higher than 1970s extraction rates).The panel says arresting such rapid extraction will req...

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