'Upcycling' organic waste in a world of thinly distributed resources

摘要

We hear all the time of natural resources which cannot be exploited because of the high costs of extraction. If you think back a few years to when oil prices were low and the only place to get oil was from drilling sites on land, then oil prices soared and off-shore drilling became financially viable. A similar pattern occurs with most of our natural resources, as the price goes up so the marginal deposits become an economic option.