Global use of materials is projected to balloon to 170-184 billion tonnes by mid-century, the report said.
The equivalent of 1.75 planets would be required to produce enough to meet humanity's needs at current consumption rates
Price spurt gets support from dovish outlook by US Federal Reserve, other central banks pm monetary policy and hopes of US-China trade war resolving
'We have to make the best possible use of resources available to us on Earth'