The BBC reports:
The planet is headed for an ecological "credit crunch", according to a report issued by conservation groups.
The document contends that our demands on natural resources overreach what the Earth can sustain by almost a third.
The Living Planet Report is the work of WWF, the Zoological Society of London and the Global Footprint Network.
It says that more than three quarters of the world's population lives in countries where consumption levels are outstripping environmental renewal.
This makes them "ecological debtors", meaning that they are drawing - and often overdrawing - on the agricultural land, forests, seas and resources of other countries to sustain them.
The report concludes that the reckless consumption of "natural capital" is endangering the world's future prosperity, with clear economic impacts including high costs for food, water and energy.
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