US President Donald Trump in 2017 and George W. Bush in 2008.
On March 1, Donald Trump imposed a series of steel and aluminum tariffs. To understand their potential impact, it's instructive to look at what happened after George W. Bush enacted similar measures in 2002.
Cities like Melbourne are a store for such huge amounts of resources that they could be used as urban mines.
Donaldytong (own work)/Wikimedia
With an ever-increasing cost to extract dwindling raw materials, it's time to look at cities as urban mines. We're developing the tools to do that.
The continent needs investment – and China has long been providing it.
There has been a rapid increase in the amount of resources tied up in buildings.
There will be huge environmental impact if we keep using raw materials as we did in the 20th century.
Researchers calculate whether we're using less materials, or whether we're just shipping it in from abroad.
Developed countries are using raw materials to sustain their economies at a much higher rate than that being captured in…