In 2009, more than 1.2 billion tonnes of steel were produced worldwide.
Compact, resource-efficient cities could see cuts of 36-54 per cent in GHG emissions, and in metals, land, energy and water use.
Renewables produce 5-6% of the GHG emissions of coal-fired plants and 8-10% of gas-fired plants.
Halting biodiversity loss means that cropland expansion will need to stop.
Last century, the global economy expanded 30-fold, but global water consumption grew by only six times.
A global stockpile of 225 million tonnes of copper is estimated to reside in landfills
Trade in material resources – biomass, fossil fuels, metals, and minerals – has increased by more than 90% in the past two decades.
The global ocean-based economy is estimated to be worth $3 trillion USD per year, which is five% of global GDP.