Don't forget to switch off the lights.

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Eco-Tip expired
This content has been archived on 21 Apr 2015, reason: Content not regularly updated
Switching off five lights in hallways and rooms in your house – when you don't need them – can save around EUR 60 a year! This prevents the release of approximately 400 kg of CO2 gas in one year.
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European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Phone: +45 3336 7100