BBC reports on the UN year of biodiversity.
The UN says that as natural systems such as forests and wetlands disappear, humanity loses the services they currently provide for free.
These include purification of air and water, protection from extreme weather events, and the provision of materials for shelter and fire.
With species extinctions running at about 1,000 times the "natural" or "background" rate, some biologists contend that we are in the middle of the Earth's sixth great extinction - the previous five stemming from natural events such as asteroid impacts.
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World's biodiversity 'crisis' needs action, says UN
BBC reports on the UN year of biodiversity.
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