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"Biological diversity underpins ecosystem functioning and the provision of ecosystem services essential for human well-being," says UN Secretary-General Ban Ki-moon in a document setting out the reasons why he called for the day's discussions.
"Its continued loss, therefore, has major implications for current and future human well-being... The maintenance and restoration of natural infrastructure can provide economic gains worth trillions of dollars a year."
The argument is that nature provides "ecosystem services" that humanity uses - such as pollination of agricultural crops by insects. If this is lost, the food supply falls....
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