"In a global economy, wealthy urban centres get much of their supply from far away. They depend on ecosystems they have never seen. Hence, overused and failing ecosystems, even if distant, become a threat to the well-being of these very urban centres. Quantifying this relationship between consumers and ecosystems that support them is both politically and scientifically a demanding exercise. Yet it needs to be done."

Georgina M. Mace, Director of Science, Institute of Zoology, Zoological Society of London

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