Prospectors sift through America's garbage in a gold rush founded on metals, plastic and paper

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The global implications of the trash boom only really hit you when you see the enormous pallets being carted away from the plant. You realise that recyclers can make vast profits from combing through ordinary rubbish, processing it and then reselling it to other companies. And that leads to another, bigger thought: trash is no longer just an environmental liability. It is becoming a financial asset. And it is everywhere.

Bob Cappadona, area manager of Casella Waste Systems' 65,000sq ft recycling facility in Massachussets, can't believe the record prices his garbage is commanding. "Aluminium cans, $900 [£450] a bale. Tin cans, $150. No 2 clear plastic, $300. Cardboard, $70. Mixed paper, $40." He barely conceals his glee as he explains the effects of a spike in metal prices: "We get an extra $100 a ton."

Mr Cappadona's numbers are compelling, but the global implications of the trash boom only really hit you when you see the enormous pallets being carted away from the plant. You realise that recyclers can make vast profits from combing through ordinary rubbish, processing it and then reselling it to other companies. And that leads to another, bigger thought: trash is no longer just an environmental liability. It is becoming a financial asset. And it is everywhere.

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Or so it would seem.

The possibilities have venture capitalists and buyout firms scrambling to invest in a melange of quirky start-ups that might have provoked belly laughs from these same financiers five years ago. The broad category of "waste and recycling", which includes everything from materials recovery to sewage biotechnology, drew a record $622m of investment in 2007, compared with $245m a year earlier and just $20m in 2001, according to Cleantech Group, a green investing consultancy. Sober investors are throwing money not only at established recyclers like Cas-ella Waste, but also at bolder ventures like trash-to-ethanol start-ups and e-waste recyclers, so confident are they that there's real cash in trash.

More than anything, it's the commodities boom – or bubble, if you prefer – that's nudging garbage to the asset side of earth's balance sheet. The calculus is simple: as the prices of oil and other raw materials rise, recycled products become more attractive.

Article continues at The Independent.