Pollution impact of wood-burning in Greece
28 January 2013 Last updated at 00:08 GMT
In Greece - the epicentre of the eurozone debt crisis - the cost of heating oil has soared with new taxes, leading more and more people to burn wood to keep warm.
This has prompted an increase in illegal logging and pollution.
Our Athens correspondent Mark Lowen travelled to the north of the country to visit a scheme to monitor pollution levels.