Labour productivity: GDP per annual working hours [1999 US$ (converted at EKS PPPs) per hour]; materials productivity: GDP per Domestic Material Consumption (DMC) [EUR per kg]; energy productivity: GDP per Total Primary Energy Supply (TPES) [thousand 1995 US$ per toe]
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in your garden or park by piling up some logs in a secluded corner. These will provide shelter for hedgehogs, frogs and toads. If you half-bury the bottom logs in the soil, you will also encourage stag beetles as they are fond of rotten wood. A pile of stones will also provide shelter to a range of insects and spiders.
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