"Using an 'Ecological Footprint' to describe the pressure human activity is placing on the biosphere will inevitably invite controversy. The Global Footprint Network is disarmingly frank about the limitations of its data and refreshingly keen to invite skeptics to suggest improvements. Let's hope those who believe there are no limits or that we're not running any risks will be equally frank about why we don't need to worry."

Simon Upton, Chair of the OECD Round Table on Sustainable Development

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