"Growing external resource dependencies are putting countries at significant risk, " said Mathis Wackernagel, President of Global Footprint Network, which collaborated with the WWF and the Zoological Society of London on the report.

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"As resource constraints tighten globally, countries that depend heavily on ecological services from other nations may find that their resource supply becomes insecure and unreliable, and this has profound economic implications, " said Wackernagel.

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