Dutch Butterfly Conservation produced an analysis in 2004 for the ETCNPB. This analysis was subcontracted and resulted to results and figures. These results and figures are free of copyrights for publications (edition, web, ...). Dutch Butterfly Conservation should be cited in any of these publications.
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Have your water boiler inspected once a year
– 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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