From this article:
“EEB has already calculated the annual loss of forests at $2-5 trillion, dwarfing costs of the banking crisis.
“Many economies remain blind to the huge value of the diversity of animals, plants and other lifeforms and their role in healthy and functioning ecosystems,” said Achim Steiner, executive director of the UN Environment Programme (Unep).
“Humanity has fabricated the illusion that somehow we can get by without biodiversity, or that it is somehow peripheral to our contemporary world: the truth is we need it more than ever on a planet of six billion heading to over nine billion people by 2050.”
The more that ecosystems become degraded, the UN says, the greater the risk that they will be pushed “over the edge” into a new stable state of much less utility to humankind.
For example, freshwater systems polluted with excess agricultural fertiliser will suffocate with algae, killing off fish and making water unfit for human consumption.
The launch of GBO-3 comes as governments begin two weeks of talks in Nairobi aimed at formulating new measures to tackle global biodiversity loss that can be adopted at October’s Convention on Biological Diversity summit in Japan.
http://news.bbc.co.uk/2/hi/science_and_environment/10103179.stm