Wildlife populations 'plummeting

Over-fishing and demand for their fins as a delicacy have hit shark numbers

Between a quarter and a third of the world's wildlife has been lost since 1970, according to data compiled by the Zoological Society of London.
Populations of land-based species fell by 25%, marine by 28% and freshwater by 29%, it says.

Humans are wiping out about 1% of all other species every year, and one of the "great extinction episodes" in the Earth's history is under way, it says.

Pollution, farming and urban expansion, over-fishing and hunting are blamed.

Source: http://news.bbc.co.uk/2/hi/uk_news/7403989.stm