In order to calculate the number of organisations that have been certified with ISO 14001 in the EU15 countries, the raw values for each EU15 country for each year are added up. The number of organisations for the EU12 countries is calculated in a similar manner.
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– to verify whether it isn't poisoning the air in your home or consuming too much energy. Have it replaced once every 15 years – to benefit from the technological advances that render new boilers more energy-efficient.
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